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TW201719284A - Photosensitive resin composition for flexographic printing and flexographic printing plate - Google Patents

Photosensitive resin composition for flexographic printing and flexographic printing plate Download PDF

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Publication number
TW201719284A
TW201719284A TW105131788A TW105131788A TW201719284A TW 201719284 A TW201719284 A TW 201719284A TW 105131788 A TW105131788 A TW 105131788A TW 105131788 A TW105131788 A TW 105131788A TW 201719284 A TW201719284 A TW 201719284A
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TW
Taiwan
Prior art keywords
mass
resin composition
hydrophilic copolymer
photosensitive resin
parts
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Application number
TW105131788A
Other languages
Chinese (zh)
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TWI610133B (en
Inventor
Hideo Saito
Takafumi Honjo
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Asahi Chemical Ind
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Publication of TWI610133B publication Critical patent/TWI610133B/en

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/004—Photosensitive materials
    • G03F7/027—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds
    • G03F7/032—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds with binders
    • G03F7/033—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds with binders the binders being polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F5/00—Rotary letterpress machines
    • B41F5/24—Rotary letterpress machines for flexographic printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N1/00—Printing plates or foils; Materials therefor
    • B41N1/12—Printing plates or foils; Materials therefor non-metallic other than stone, e.g. printing plates or foils comprising inorganic materials in an organic matrix
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/004—Photosensitive materials
    • G03F7/027—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/004—Photosensitive materials
    • G03F7/027—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds
    • G03F7/028—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds with photosensitivity-increasing substances, e.g. photoinitiators
    • G03F7/031—Organic compounds not covered by group G03F7/029
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/004—Photosensitive materials
    • G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/20—Exposure; Apparatus therefor
    • G03F7/2002—Exposure; Apparatus therefor with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image
    • G03F7/2004—Exposure; Apparatus therefor with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image characterised by the use of a particular light source, e.g. fluorescent lamps or deep UV light
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/20—Exposure; Apparatus therefor
    • G03F7/2022—Multi-step exposure, e.g. hybrid; backside exposure; blanket exposure, e.g. for image reversal; edge exposure, e.g. for edge bead removal; corrective exposure
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/20—Exposure; Apparatus therefor
    • G03F7/2022—Multi-step exposure, e.g. hybrid; backside exposure; blanket exposure, e.g. for image reversal; edge exposure, e.g. for edge bead removal; corrective exposure
    • G03F7/2024—Multi-step exposure, e.g. hybrid; backside exposure; blanket exposure, e.g. for image reversal; edge exposure, e.g. for edge bead removal; corrective exposure of the already developed image
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/26—Processing photosensitive materials; Apparatus therefor
    • G03F7/30—Imagewise removal using liquid means
    • G03F7/32—Liquid compositions therefor, e.g. developers
    • G03F7/322—Aqueous alkaline compositions
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/26—Processing photosensitive materials; Apparatus therefor
    • G03F7/40—Treatment after imagewise removal, e.g. baking

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Architecture (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Materials For Photolithography (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
  • Printing Plates And Materials Therefor (AREA)

Abstract

Provided is a photosensitive resin composition for flexographic printing comprising at least (A) a hydrophilic copolymer, (B) an elastomer, (C) a polymerizable unsaturated monomer, and (D) a photopolymerization initiator, wherein the surface area SA of a phase comprising the hydrophilic copolymer (A) accounts for 15-60% of the cross section of the cured resin composition, and a phase having a surface area of 3 [mu]m2 or greater but less than 100 [mu]m2 accounts for at least 20% of the surface area of the phase comprising the hydrophilic copolymer (A).

Description

柔版印刷用感光性樹脂組合物及柔版印刷原版Photosensitive resin composition for flexographic printing and flexographic printing original

本發明係關於一種用於柔版印刷原版或印刷版之感光層之柔版印刷用感光性樹脂組合物及使用該柔版印刷用感光性樹脂組合物之柔版印刷原版。The present invention relates to a photosensitive resin composition for flexographic printing of a photosensitive layer for a flexographic printing original or a printing plate, and a flexographic printing original plate using the photosensitive resin composition for flexographic printing.

柔版印刷為凸版印刷之一種，由於印刷版使用橡膠或合成樹脂等柔軟之材質，因此具有可應用於各種被印刷體之優點。 關於柔版印刷中所使用之印刷版，自先前以來有使用負像膜進行製版之方法、及將於電腦上經處理之資訊直接描繪成印刷版狀而製作凸紋之電腦製版技術(以下稱為CTP(Computer To Plate，電腦直接製版)技術)，近年來，CTP技術正成為主流。 關於柔版印刷版之原版，於使用負像膜之情形時與使用CTP技術之情形時版構成不同。使用負像膜之情形與使用CTP技術之情形兩者均於在PET(Polyethylene Terephthalate，聚對苯二甲酸乙二酯)樹脂等之基板上具備包含感光性樹脂組合物之感光層之方面共通，但於使用負像膜之情形時與使用CTP技術之情形時，於感光層上所構成者不同。首先，於使用負像膜之情形時，因感光層之黏著性而存在用以保護負像膜之透明圖像載體層，於使用前使負像膜密接於透明圖像載體層上，自負像膜之上向感光層照射紫外線，去除未硬化部分，藉此形成凸紋像。另一方面，於使用CTP技術之情形時，於感光層之上積層紅外線剝蝕層，直接利用雷射等對該紅外線剝蝕層進行描繪後，對感光層照射紫外線，去除未硬化部分，藉此形成凸紋像。 最近，存在藉由利用將水作為主成分之顯影液進行該未硬化部分之去除(進行水顯影)而形成凸紋像之情形。 且說，通常於可進行水系顯影之柔版印刷用感光性樹脂印刷原版中，於用以維持尺寸精度之支持體上形成有如下感光層，其包含將親水性共聚物、彈性體等疏水性樹脂、聚合性不飽和單體、及光聚合起始劑等混合而成之感光性樹脂組合物。 關於此種感光層中所使用之感光性樹脂組合物，為了忠實地獲得需要之圖像，較佳為組合物中之各成分細密且均勻地分散，又，為了縮短製版時間，較佳為顯影速度較快。進而，就製版後必須耐受水性油墨之使用、利用水將所附著之油墨沖去之方面而言，較佳為硬化後之水膨潤率較低，又，當然耐印性宜較高。 作為可進行水顯影之感光性樹脂組合物，例如專利文獻1中揭示有如下感光性樹脂組合物，其含有水分散乳膠、光聚合性單體、橡膠、及光聚合起始劑。 又，專利文獻2中揭示有如下感光性樹脂組合物，其進而含有磺酸系界面活性劑，且橡膠形成尺寸為10 μm以下之分散相。 進而，專利文獻3中揭示有如下感光性樹脂組合物，其中，水分散乳膠係藉由使用含有不飽和雙鍵之反應性乳化劑之乳化聚合而合成並進行內部交聯而成者。 [先前技術文獻] [專利文獻] [專利文獻1]日本專利第4211141號公報 [專利文獻2]日本專利第5325823號公報 [專利文獻3]日本專利第4627871號公報Flexographic printing is one type of relief printing. Since the printing plate uses a soft material such as rubber or synthetic resin, it has the advantage that it can be applied to various printed bodies. Regarding the printing plate used in flexographic printing, a method of making a plate using a negative film has been used, and a computer plate making technique for directly forming a printed plate by processing information on a computer to produce a relief pattern (hereinafter referred to as a printing plate) For CTP (Computer To Plate) technology, CTP technology is becoming mainstream in recent years. Regarding the original version of the flexographic printing plate, the case of using the negative film is different from the case of using the CTP technology. Both the case of using a negative film and the case of using a CTP technology are common to a photosensitive layer containing a photosensitive resin composition on a substrate such as a PET (Polyethylene Terephthalate) resin. However, in the case of using a negative film and when using a CTP technique, the composition on the photosensitive layer is different. First, in the case of using a negative film, a transparent image carrier layer for protecting the negative film exists due to the adhesion of the photosensitive layer, and the negative image is adhered to the transparent image carrier layer before use, and the negative image is used. The photosensitive layer is irradiated with ultraviolet rays on the film to remove the uncured portion, thereby forming a relief image. On the other hand, in the case of using the CTP technology, an infrared ablation layer is laminated on the photosensitive layer, and the infrared ablation layer is directly drawn by laser or the like, and then the photosensitive layer is irradiated with ultraviolet rays to remove the unhardened portion, thereby forming A relief image. Recently, there has been a case where a relief image is formed by removing the unhardened portion (developing water) using a developing solution containing water as a main component. In addition, in a photosensitive resin printing original plate for flexographic printing which can be subjected to water-based development, a photosensitive layer containing a hydrophobic resin such as a hydrophilic copolymer or an elastomer is formed on a support for maintaining dimensional accuracy. A photosensitive resin composition obtained by mixing a polymerizable unsaturated monomer and a photopolymerization initiator. In order to faithfully obtain a desired image, it is preferred that the photosensitive resin composition used in such a photosensitive layer be finely and uniformly dispersed in the composition, and in order to shorten the plate making time, development is preferred. Faster. Further, in terms of having to withstand the use of the aqueous ink after the plate making and flushing the adhered ink with water, it is preferred that the water swelling rate after hardening is low, and of course, the printing durability is preferably high. For example, Patent Document 1 discloses a photosensitive resin composition containing a water-dispersible latex, a photopolymerizable monomer, a rubber, and a photopolymerization initiator. Further, Patent Document 2 discloses a photosensitive resin composition further containing a sulfonic acid-based surfactant and a rubber having a dispersed phase of a size of 10 μm or less. Further, Patent Document 3 discloses a photosensitive resin composition obtained by emulsion polymerization using a reactive emulsifier containing an unsaturated double bond and internally crosslinked. [PRIOR ART DOCUMENT] [Patent Document 1] Japanese Patent No. 4,211, 141 [Patent Document 2] Japanese Patent No. 5325823 (Patent Document 3) Japanese Patent No. 4,627,871

[發明所欲解決之問題] 然而，專利文獻1及2中所記載之可進行水系顯影之感光性樹脂組合物存在如下問題：使用其之印刷版之耐水性較低，或油墨附著後之耐印性降低。 另一方面，專利文獻3中所記載之可進行水系顯影之感光性樹脂組合物雖然印刷版之耐水性或耐印性較高，但存在於水系顯影液中之顯影性較低之問題。 如此，對柔版印刷用之印刷原版中所使用之感光性樹脂組合物，要求於水系顯影液中之良好之顯影性、與製成印刷版後之耐水性或耐印性，但該等亦具有相反之方面，難以實現其並存。 [解決問題之技術手段] 本發明者等人對此種課題進行了努力研究，結果發現，若於形成印刷原版之感光層之感光性樹脂組合物中，使包含親水性共聚物(A)之相適度地微分散，則可同時解決於水系顯影液中之顯影性與印刷版之耐水性及耐印性兩者，從而完成了本發明。 即，本發明係如下所述者。 [1]一種柔版印刷用感光性樹脂組合物，其係至少含有如下成分者： (A)親水性共聚物、 (B)彈性體、 (C)聚合性不飽和單體、及 (D)光聚合起始劑，且 於該樹脂組合物之硬化物之剖面中，包含上述親水性共聚物(A)之相所占之比率(面積率)SA 為15%以上且未達60%， 上述剖面中之包含上述親水性共聚物(A)之相之中，相面積為3 μm2 以上且未達100 μm2 之相所占之比率為20(面積%)以上。 [2]如[1]中所記載之柔版印刷用感光性樹脂組合物，其中上述SA (面積%)與上述樹脂組合物中之親水性共聚物(A)之質量比率WA (質量%)之比SA /WA 為1.35以上。 [3]如[1]或[2]中所記載之柔版印刷用感光性樹脂組合物，其中相對於上述親水性共聚物(A)100質量份，包含50～250質量份之上述彈性體(B)、10～200質量份之上述聚合性不飽和單體(C)、0.1～50質量份之上述光聚合起始劑(D)。 [4]如[1]至[3]中任一項所記載之柔版印刷用感光性樹脂組合物，其進而含有0.1～15質量份之選自由界面活性劑及具有聚伸烷基二醇鏈之(甲基)丙烯酸酯單體所組成之群中之至少1種化合物(E)。 [5]如[1]至[4]中任一項所記載之柔版印刷用感光性樹脂組合物，其中相對於上述親水性共聚物(A)100質量份，進而含有1～250質量份之塑化劑成分(F)。 [6]如[5]中所記載之柔版印刷用感光性樹脂組合物，其中上述塑化劑成分(F)包含至少1種經OH基及/或羧基改性而成之液狀聚丁二烯之末端改性物。 [7]如[1]至[6]中任一項所記載之柔版印刷用感光性樹脂組合物，其中至少於包含上述親水性共聚物(A)之相中包含上述聚合性不飽和單體(C)。 [8]如[1]至[7]中任一項所記載之柔版印刷用感光性樹脂組合物，其中上述彈性體(B)為熱塑性嵌段共聚物。 [9]如[1]至[8]中任一項所記載之柔版印刷用感光性樹脂組合物，其中上述親水性共聚物(A)係包含源自含有不飽和雙鍵之反應性乳化劑之單元、且進行內部交聯而成之聚合物粒子。 [10]一種如[1]至[9]中任一項所記載之柔版印刷用感光性樹脂組合物之製造方法，其依序包括以下所記載之步驟1～3： 1.於含親水性共聚物(A)之水分散液中，添加選自由界面活性劑及具有聚伸烷基二醇鏈之(甲基)丙烯酸酯單體所組成之群中之至少1種化合物(E)及/或塑化劑成分(F)之步驟； 2.自上述含親水性共聚物(A)之水分散液中去除水之步驟；及 3.於步驟2中所獲得之包含親水性共聚物(A)之混合物中，添加彈性體(B)、聚合性不飽和單體(C)、及光聚合起始劑(D)，並進行混練之步驟。 [11]一種柔版印刷原版，其具有包含如[1]至[9]中任一項所記載之柔版印刷用感光性樹脂組合物之感光層。 [發明之效果] 根據本發明，可獲得一種於水系顯影液中之洗淨性較高、且耐油墨性或耐印性優異之柔版印刷用原版。[Problems to be Solved by the Invention] However, the photosensitive resin composition which can be subjected to water-based development described in Patent Documents 1 and 2 has a problem that the printing plate using the same has low water resistance or resistance after adhesion of the ink. The printability is reduced. On the other hand, the photosensitive resin composition which can be subjected to water-based development described in Patent Document 3 has a problem that the water resistance and the printing durability of the printing plate are high, but the developability in the aqueous developing solution is low. Thus, the photosensitive resin composition used for the printing original plate for flexographic printing is required to have good developability in an aqueous developing solution and water resistance or print durability after the printing plate is formed, but these are also On the contrary, it is difficult to achieve coexistence. [Means for Solving the Problem] The inventors of the present invention have made an effort to study such a problem, and have found that the hydrophilic copolymer (A) is contained in the photosensitive resin composition forming the photosensitive layer of the printing original plate. The micro-dispersion is moderately solved, and both the developability in the aqueous developing solution and the water resistance and print durability of the printing plate can be simultaneously solved, thereby completing the present invention. That is, the present invention is as follows. [1] A photosensitive resin composition for flexographic printing comprising at least the following components: (A) a hydrophilic copolymer, (B) an elastomer, (C) a polymerizable unsaturated monomer, and (D) a photopolymerization initiator, in which the ratio (area ratio) S A of the phase containing the hydrophilic copolymer (A) is 15% or more and less than 60% in the cross section of the cured product of the resin composition. Among the phases including the hydrophilic copolymer (A) in the cross section, the ratio of the phase having a phase area of 3 μm 2 or more and less than 100 μm 2 is 20 (area%) or more. [2] The photosensitive resin composition for flexographic printing according to [1], wherein the mass ratio of the above S A (area %) to the hydrophilic copolymer (A) in the resin composition is W A (mass %) The ratio S A /W A is 1.35 or more. [3] The photosensitive resin composition for flexographic printing according to [1] or [2], wherein the elastomer is contained in an amount of 50 to 250 parts by mass based on 100 parts by mass of the hydrophilic copolymer (A). (B), 10 to 200 parts by mass of the above polymerizable unsaturated monomer (C), and 0.1 to 50 parts by mass of the above photopolymerization initiator (D). [4] The photosensitive resin composition for flexographic printing according to any one of [1] to [3] further comprising 0.1 to 15 parts by mass of a surfactant selected from the group consisting of a surfactant and a polyalkylene glycol At least one compound (E) of the group consisting of chain (meth) acrylate monomers. [5] The photosensitive resin composition for flexographic printing according to any one of the above [1], wherein the hydrophilic copolymer (A) further contains 1 to 250 parts by mass based on 100 parts by mass of the hydrophilic copolymer (A). Plasticizer component (F). [6] The photosensitive resin composition for flexographic printing according to [5], wherein the plasticizer component (F) comprises at least one liquid polybutadiene modified by an OH group and/or a carboxyl group. Terminal modification of the diene. [7] The photosensitive resin composition for flexographic printing according to any one of the above [1], wherein the polymerizable unsaturated single sheet is contained in at least the phase containing the hydrophilic copolymer (A). Body (C). [8] The photosensitive resin composition for flexographic printing according to any one of [1] to [7] wherein the elastomer (B) is a thermoplastic block copolymer. The photosensitive resin composition for flexographic printing according to any one of the above aspects, wherein the hydrophilic copolymer (A) contains a reactive emulsification derived from an unsaturated double bond. A polymer particle obtained by internally crosslinking the unit of the agent. [10] The method for producing a photosensitive resin composition for flexographic printing according to any one of [1] to [9], which comprises the following steps 1 to 3: 1. To the aqueous dispersion of the copolymer (A), at least one compound (E) selected from the group consisting of a surfactant and a (meth) acrylate monomer having a polyalkylene glycol chain; / or a plasticizer component (F) step; 2. a step of removing water from the aqueous dispersion containing the hydrophilic copolymer (A); and 3. a hydrophilic copolymer obtained in the step 2 ( In the mixture of A), an elastomer (B), a polymerizable unsaturated monomer (C), and a photopolymerization initiator (D) are added, and a step of kneading is carried out. [11] A photosensitive layer of a photosensitive resin composition for flexographic printing according to any one of [1] to [9]. [Effects of the Invention] According to the present invention, it is possible to obtain a flexographic printing original plate which has high detergency in an aqueous developing solution and is excellent in ink resistance and print durability.

以下對用以實施本發明之形態(以下稱為「本實施形態」)詳細地進行說明，但本發明並不限定於此，可於不脫離其主旨之範圍內進行各種變化。 於本實施形態中，柔版印刷用感光性樹脂組合物係含有(A)親水性共聚物、(B)彈性體、(C)聚合性不飽和單體、(D)光聚合起始劑者，可適宜地用於利用水系顯影液之柔版印刷版之感光性樹脂組合物層。 於本實施形態中，所謂親水性共聚物(A)，係包含源自親水性之不飽和單體之單元且進行內部交聯而成之聚合物粒子。源自親水性之不飽和單體之單元例如可設為0.1～20質量%，亦可設為0.5～15質量%，亦可設為1～10質量%。作為此種聚合物粒子，例如可列舉：將使用親水性之不飽和單體、及視需要可與其進行共聚合之其他單體進行乳化聚合而獲得之聚合物粒子作為分散質分散於水中，自所獲得之水分散乳膠中去除水而獲得者。 作為親水性之不飽和單體，較佳為包含至少一個親水性基及不飽和雙鍵之單體，例如可列舉：包含羧酸、磺酸、磷酸等或該等之鹽或酸酐等的包含不飽和雙鍵之單體，包含羥基及不飽和雙鍵之單體，包含丙烯醯胺及不飽和雙鍵之單體，包含反應性之不飽和雙鍵之界面活性劑(單體)等。該等化合物可僅使用一種，亦可同時使用兩種以上之複數種。 作為此種水分散乳膠，並無特別限定，例如可列舉：丙烯腈-丁二烯共聚物乳膠、聚氯丁二烯乳膠、聚異戊二烯乳膠、聚胺基甲酸酯乳膠、(甲基)丙烯酸酯-丁二烯乳膠、乙烯基吡啶聚合物乳膠、丁基聚合物乳膠、聚硫橡膠聚合物乳膠、丙烯酸酯聚合物乳膠等水分散乳膠聚合物等，又，該等水分散乳膠與如下含酸性官能基之不飽和單體之1種以上進行共聚合而成者亦較佳：(甲基)丙烯酸酯；或丙烯酸、甲基丙烯酸、丁烯酸、乙烯基苯甲酸、桂皮酸等羧酸，或苯乙烯磺酸等磺酸等一元酸；或伊康酸、反丁烯二酸、順丁烯二酸、檸康酸、黏康酸等二元酸等。 再者，於上述水分散乳膠中，除了含有使用親水性之不飽和單體、及視需要可與其進行共聚合之其他單體進行乳化聚合而獲得之聚合物粒子以外，亦可進而含有其他聚合物粒子作為分散質。作為此種其他聚合物，例如可列舉：聚丁二烯、天然橡膠、苯乙烯-丁二烯共聚物。 該等之中，就耐印性之觀點而言，較佳為分子鏈中含有丁二烯骨架或異戊二烯骨架之水分散乳膠。具體而言，較佳為聚丁二烯乳膠、苯乙烯-丁二烯共聚物乳膠、丙烯腈-丁二烯共聚物乳膠，或/及該等水分散乳膠與(甲基)丙烯酸酯或丙烯酸、甲基丙烯酸、伊康酸等進行共聚合而成者。進而較佳為苯乙烯-丁二烯共聚物與(甲基)丙烯酸酯、或丙烯酸、甲基丙烯酸、伊康酸等含酸性官能基之不飽和單體之1種以上進行共聚合而成之共聚物之水分散乳膠。 關於含酸性官能基之不飽和單體之使用量，較佳為用於合成親水性共聚物(A)之不飽和單體總量中之1～30質量%。若設為1質量%以上，則有容易進行水系顯影之傾向，另一方面，若設為30質量%以下，則可防止感光性樹脂組合物之吸濕量增加，或油墨之膨潤量增加，感光性樹脂組合物之混合時之加工性劣化之情況。 作為可用於合成親水性共聚物(A)之含酸性官能基之不飽和單體以外之不飽和單體，可列舉：共軛二烯、芳香族乙烯系化合物、(甲基)丙烯酸酯、具有羥基之乙烯系單羧酸烷基酯單體、不飽和二元酸烷基酯、順丁烯二酸酐、乙烯基氰化合物、(甲基)丙烯醯胺及其衍生物、乙烯酯類、乙烯醚類、鹵化乙烯類、具有胺基之鹼性單體、乙烯基吡啶、烯烴、含矽之α,β-乙烯性不飽和單體、烯丙基化合物等。 更具體而言，作為共軛二烯，可例示：1,3-丁二烯、異戊二烯、2,3-二甲基-1,3-丁二烯、2-乙基-1,3-丁二烯、2-甲基-1,3-丁二烯、1,3-戊二烯、氯丁二烯、2-氯-1,3-丁二烯、環戊二烯等。 作為芳香族乙烯系化合物，可例示：苯乙烯、α-甲基苯乙烯、鄰甲基苯乙烯、間甲基苯乙烯、對甲基苯乙烯、乙基苯乙烯、乙烯基甲苯、乙烯基二甲苯、溴苯乙烯、乙烯基苄基氯、對第三丁基苯乙烯、氯苯乙烯、烷基苯乙烯、二乙烯基苯、三乙烯基苯等。 作為(甲基)丙烯酸酯，可例示：(甲基)丙烯酸甲酯、(甲基)丙烯酸乙酯、(甲基)丙烯酸丙酯、(甲基)丙烯酸正丁酯、(甲基)丙烯酸第三丁酯、(甲基)丙烯酸異丁酯、(甲基)丙烯酸正戊酯、(甲基)丙烯酸異戊基己酯、(甲基)丙烯酸辛酯、(甲基)丙烯酸壬酯、(甲基)丙烯酸癸酯、(甲基)丙烯酸十二烷基酯、(甲基)丙烯酸十八烷基酯、(甲基)丙烯酸環己酯、(甲基)丙烯酸苯酯、(甲基)丙烯酸苄酯、(甲基)丙烯酸2-乙基-己酯、(甲基)丙烯酸羥基乙酯、(甲基)丙烯酸羥基丙酯、(甲基)丙烯酸羥基環己酯、(甲基)丙烯酸縮水甘油酯、乙二醇二(甲基)丙烯酸酯、乙二醇二(甲基)丙烯酸酯、1,3-丁二醇二(甲基)丙烯酸酯、1,4-丁二醇二(甲基)丙烯酸酯、丙二醇二(甲基)丙烯酸酯、1,5-戊二醇二(甲基)丙烯酸酯、新戊二醇二(甲基)丙烯酸酯、1,6-己二醇二(甲基)丙烯酸酯、二乙二醇二(甲基)丙烯酸酯、三乙二醇二(甲基)丙烯酸酯、四乙二醇二(甲基)丙烯酸酯、聚乙二醇二(甲基)丙烯酸酯、聚丙二醇二(甲基)丙烯酸酯、季戊四醇三(甲基)丙烯酸酯、三羥甲基丙烷三(甲基)丙烯酸酯、四羥甲基甲烷四(甲基)丙烯酸酯、 (甲基)丙烯酸烯丙酯、雙(4-丙烯醯氧基聚乙氧基苯基)丙烷、甲氧基聚乙二醇(甲基)丙烯酸酯、β-(甲基)丙烯醯氧基乙基氫鄰苯二甲酸酯、β-(甲基)丙烯醯氧基乙基氫琥珀酸酯、(甲基)丙烯酸3-氯-2-羥基丙酯、(甲基)丙烯酸硬脂酯、(甲基)丙烯酸苯氧基乙酯、苯氧基聚乙二醇(甲基)丙烯酸酯、2-羥基-1,3-二(甲基)丙烯醯氧基丙烷、2,2-雙[4-((甲基)丙烯醯氧基乙氧基)苯基]丙烷、2,2-雙[4-((甲基)丙烯醯氧基-二乙氧基)苯基]丙烷、2,2-雙[4-((甲基)丙烯醯氧基-聚乙氧基)苯基]丙烷、(甲基)丙烯酸異　酯等。 作為具有羥基之乙烯系單羧酸烷基酯單體，例如可列舉：丙烯酸2-羥基乙酯、甲基丙烯酸2-羥基乙酯、丙烯酸2-羥基丙酯、甲基丙烯酸2-羥基丙酯、丙烯酸1-羥基丙酯、甲基丙烯酸1-羥基丙酯、(甲基)丙烯酸羥基環己酯等。 作為不飽和二元酸烷基酯，可例示：丁烯酸烷基酯、伊康酸烷基酯、反丁烯二酸烷基酯、順丁烯二酸烷基酯等。 作為乙烯基氰化合物，可例示丙烯腈、甲基丙烯腈等。 作為(甲基)丙烯醯胺及其衍生物，可例示：(甲基)丙烯醯胺、N-羥甲基(甲基)丙烯醯胺、N-烷氧基(甲基)丙烯醯胺等。 作為乙烯酯類，可例示：乙酸乙烯酯、丁酸乙烯酯、硬脂酸乙烯酯、月桂酸乙烯酯、肉豆蔻酸乙烯酯、丙酸乙烯酯、柯赫酸乙烯酯等。 作為乙烯醚類，可例示：甲基乙烯醚、乙基乙烯醚、丙基乙烯醚、丁基乙烯醚、戊基乙烯醚、己基乙烯醚等。 作為鹵化乙烯類，可例示：氯乙烯、溴乙烯、氟乙烯、偏二氯乙烯、偏二氟乙烯等。 作為具有胺基之鹼性單體，可例示：(甲基)丙烯酸胺基乙酯、(甲基)丙烯酸二甲基胺基乙酯、(甲基)丙烯酸二乙基胺基乙酯等。 作為烯烴，可例示乙烯等。 作為含矽之α,β-乙烯性不飽和單體，可例示乙烯基三氯矽烷、乙烯基三乙氧基矽烷等。 作為烯丙基化合物，可例示烯丙酯、鄰苯二甲酸二烯丙酯等。 除此以外，亦可使用異氰尿酸三烯丙酯等具有3個以上之雙鍵之單體。 該等單體可單獨使用，亦可混合使用兩種以上。共軛二烯與其他單體之質量比較佳為在5/95至95/5之間，更佳為50/50至90/10。若超過該範圍，則存在使柔版印刷用感光樹脂組合物之橡膠彈性劣化之情形。 親水性共聚物(A)較佳為藉由乳化聚合進行合成者，於該情形時，較佳為使用反應性乳化劑作為聚合時所使用之乳化劑(界面活性劑)。 作為反應性乳化劑，係於分子結構中含有自由基聚合性之雙鍵、親水性官能基及疏水性基，與一般之乳化劑同樣地具有乳化、分散、及濕潤功能者，於使親水性共聚物(A)進行乳化聚合時，於相對於除了反應性乳化劑以外之不飽和單體100質量份而單獨使用0.1質量份以上之情形時，較佳為可合成平均粒徑為5～500 nm之聚合物般之乳化(界面活性)劑。 作為分子結構中之自由基聚合性之雙鍵之結構例，可列舉：乙烯基、丙烯醯基、或甲基丙烯醯基等。作為分子結構中之親水性官能基之例，可列舉：硫酸基、硝酸基、磷酸基、硼酸基、羧基等陰離子性基；胺基等陽離子性基；聚氧伸乙基、聚氧亞甲基、聚氧伸丙基等聚氧伸烷基鏈結構等；或羥基等。作為分子結構中之疏水性基，可列舉烷基、苯基等。 反應性乳化劑根據其結構中所含之親水性官能基之結構種類而包含陰離子性乳化劑、非離子性乳化劑、陽離子性乳化劑、兩性乳化劑等。又，分子結構中之自由基聚合性之雙鍵、親水性官能基及疏水性基亦可分別含有複數種。 若將於本實施形態中可用作反應性乳化劑者中之通常市售者示於以下，則作為陰離子界面活性劑，可例示：ADEKA REASOAP SE(旭電化工業)、AQUALON HS或BC或KH(第一工業製藥)、Latemul S(花王)、Antox MS(日本乳化劑)、ADEKA REASOAP SDX或PP(旭電化工業)、Hytenol A(第一工業製藥)、Eleminol RS(三洋化成工業)、SPINOMAR(東洋曹達工業)等，作為非離子界面活性劑，可例示：AQUALON RN或Noigen N(第一工業製藥)、ADEKA REASOAP NE(旭電化工業)等，但並不限定於該等。該等可單獨使用，亦可組合使用兩種以上。 於本實施形態中，相對於根據原料之添加量所計算之親水性共聚物(A)100質量份，反應性乳化劑之使用量較佳為1～20質量份之範圍。若反應性乳化劑之量為1質量份以上，則有所獲得之印刷版之圖像再現性提高之傾向，若為20質量份以下，則有所獲得之印刷版之耐印刷性提高之傾向。 於本實施形態中，於藉由乳化聚合而合成親水性共聚物(A)之情形時，視需要亦可使用非反應性乳化劑。 此處，作為視需要而使用之非反應性乳化劑，例如可例示：脂肪酸皂、松脂酸皂、磺酸鹽、硫酸鹽、磷酸酯、多磷酸酯、肌胺酸醯基酯等陰離子界面活性劑；腈化油脂衍生物、油脂衍生物、脂肪酸衍生物、α-烯烴衍生物等陽離子界面活性劑；醇乙氧基化物、烷基苯酚乙氧基化物、丙氧基化物、脂肪族烷醇醯胺、烷基聚糖苷、聚氧乙烯山梨醇酐脂肪酸酯、氧乙烯氧丙烯嵌段共聚物等非離子界面活性劑。該等可單獨使用，亦可組合使用兩種以上。 作為磺酸鹽，可列舉：烷基磺酸鹽、烷基硫酸鹽、烷基磺基琥珀酸鹽、聚氧乙烯烷基硫酸鹽、磺化油脂、烷基二苯醚二磺酸鹽、α-烯烴磺酸鹽、烷基甘油醚磺酸鹽、N-醯基甲基牛磺酸鹽等。 作為該等界面活性劑之其他例，可列舉「界面活性劑手冊(高橋、難波、小池、小林：工學圖書，1972)」中所記載者等。 相對於根據原料之添加量所計算之親水性共聚物(A)100質量份，非反應性乳化劑之使用量較佳為未達1質量份。若為未達1質量份之情形，則所獲得之印刷版可顯示出適當之水膨潤率，防止油墨附著時之耐磨耗性之降低及吸濕後之圖像再現性之降低。 作為親水性共聚物(A)之乳化聚合方法，通常於經調整為可進行聚合之溫度之反應系統中預先添加特定量之水、乳化劑、其他添加劑，於該系統中，藉由分次操作或連續操作將聚合起始劑及不飽和單體、乳化劑、調整劑等添加至反應系統內。又，視需要於反應系統中預先添加特定量之種乳膠、起始劑、不飽和單體、其他調整劑亦為通常經常使用之方法。 又，藉由設法向反應系統中添加不飽和單體、乳化劑、其他添加劑、調整劑之方法，亦可階段性地改變所合成之親水性共聚物粒子之層結構。 於該情形時，作為代表各層之結構之物性，可列舉：親水性、玻璃轉移點、分子量、交聯密度等。又，該層結構之階段數並無特別限制。 於本實施形態中，於親水性共聚物(A)之聚合中可使用已知之鏈轉移劑。舉例而言，作為含有硫元素之鏈轉移劑，可列舉：第三-十二烷基硫醇、正十二烷基硫醇等烷烴硫醇；巰基乙醇、巰基丙醇等硫代烷醇；硫代乙醇酸、硫代丙酸等硫代烷基羧酸；硫代乙醇酸辛酯、硫代丙酸辛酯等硫代羧酸烷基酯；二甲基硫醚、二乙基硫醚等硫醚。此外，作為鏈轉移劑之例，可列舉：異松油烯、二戊烯、第三萜品烯及四氯化碳等鹵化烴。該等之中，烷烴硫醇由於鏈轉移速度較大，又，所獲得之聚合物之物性平衡良好，故而較佳。 該等鏈轉移劑可單獨使用，亦可混合使用兩種以上。該等鏈轉移劑係混合至單體中而供給至反應系統中，或於特定之時期單獨添加特定量。相對於用於合成親水性共聚物(A)之不飽和單體總量，該等鏈轉移劑之使用量較佳為0.1～10質量%。若為該範圍以下，則存在進行感光性樹脂組合物之混合時之加工性劣化之情形，若為該範圍之以上，則存在明顯降低分子量之情形。 於本實施形態中，於親水性共聚物(A)之聚合中可視需要使用聚合反應抑制劑。 所謂聚合反應抑制劑，為藉由添加至乳化聚合系統中而降低自由基聚合速度之化合物。更具體而言，為聚合速度延遲劑、聚合禁止劑、自由基再開始反應性較低之鏈轉移劑、及自由基再開始反應性較低之單體。聚合反應抑制劑通常係用於調整聚合反應速度及調整乳膠物性。該等聚合反應抑制劑係藉由分次操作或連續操作而添加至反應系統中。於使用聚合反應抑制劑之情形時，乳膠覆膜之強度提高，耐印性提高。反應機制之詳細情況雖然尚不明確，但認為聚合反應抑制劑與聚合物之立體結構密切相關，由此推測於乳膠覆膜之物性之調整方面存在效果。 作為聚合反應抑制劑之例，可列舉：鄰、間、或對苯醌等醌類；硝基苯，鄰、間、或對二硝基苯等硝基化合物；二苯基胺般之胺類；第三丁基鄰苯二酚般之鄰苯二酚衍生物；1,1-二苯基乙烯或α-甲基苯乙烯、2,4-二苯基-4-甲基-1-戊烯等1,1-二取代乙烯系化合物；2,4-二苯基-4-甲基-2-戊烯、環己烯等1,2-二取代乙烯系化合物等。除此以外，亦可列舉：「POLYMER HANDBOOK 3rd Ed. (J. Brandup, E. H. Immergut : John Wiley ＆ Sons, 1989)」、「修訂高分子合成之化學(大津：化學同人，1979.)」中作為聚合禁止劑或聚合抑制劑而記載之化合物。該等之中，就反應性之方面而言，尤佳為2,4-二苯基-4-甲基-1-戊烯(α-甲基苯乙烯二聚物)。該等聚合反應抑制劑可單獨使用，亦可混合使用兩種以上。 相對於親水性共聚物(A)之聚合中所使用之不飽和單體總量，該等聚合反應抑制劑之使用量較佳為10質量%以下。若為其以上，則存在明顯降低聚合速度之情形。 上述自由基聚合起始劑係於熱或還原性物質之存在下發生自由基分解而引發單體之加成聚合者，無機系起始劑及有機系起始劑均可使用。 作為此種自由基聚合起始劑，例如可列舉：水溶性或油溶性之過氧二硫酸鹽、過氧化物、偶氮雙化合物等，具體而言，有過氧二硫酸鉀、過氧二硫酸鈉、過氧二硫酸銨、過氧化氫、氫過氧化第三丁基、過氧化苯甲醯、2,2-偶氮雙丁腈、氫過氧化異丙苯等，又，此外可列舉POLYMER HANDBOOK (3rd edition)、J. Brandrup及E. H. Immergut著、John Willy ＆ Sons刊(1989)中所記載之化合物。又，亦可採用將酸性亞硫酸鈉、抗壞血酸或其鹽、異抗壞血酸或其鹽、雕白粉等還原劑與聚合起始劑組合而使用之所謂氧化還原聚合法。該等之中，過氧二硫酸鹽尤其適宜作為聚合起始劑。關於該聚合起始劑之使用量，以所有不飽和單體之質量為基準，通常自0.1～5.0質量%之範圍內選擇，較佳為自0.2～3.0質量%之範圍內選擇。若為該範圍以下，則存在無法獲得親水性共聚物之合成時之穩定性之情形，若為該範圍以上，則存在感光性樹脂組合物之吸濕量增加之情形。 於本實施形態中，於親水性共聚物(A)之合成時，可視需要添加各種聚合調整劑。例如，作為pH值調整劑，可添加氫氧化鈉、氫氧化鉀、氫氧化銨、碳酸氫鈉、碳酸鈉、磷酸氫二鈉等pH值調整劑。又，亦可添加乙二胺四乙酸鈉等各種螯合劑等作為聚合調整劑。又，作為其他添加劑，亦可添加鹼感應性乳膠、六偏磷酸等減黏劑、聚乙烯醇、羧甲基纖維素等水溶性高分子、增黏劑、各種抗老化劑、紫外線吸收劑、防腐劑、殺菌劑、消泡劑、聚丙烯酸鈉等分散劑、耐水化劑、鋅白等金屬氧化物、異氰酸酯系化合物、環氧化合物等交聯劑、潤滑劑、保水劑等各種添加劑。該等添加劑之添加方法並無特別限制，無論在親水性共聚物之合成時、合成後均可添加。 於本實施形態中，於將親水性共聚物(A)乳化聚合之情形時之聚合溫度通常係於60～120℃之範圍內選擇，但藉由上述氧化還原聚合法等，亦可於更低之溫度下進行聚合。進而，作為氧化還原觸媒，亦可使金屬觸媒、例如二價鐵離子、三價鐵離子、銅離子等共存。 親水性共聚物(A)較佳為粒子狀，其平均粒徑較佳為500 nm以下，尤佳為100 nm以下。若平均粒徑過大，則存在所獲得之印刷原版之水系顯影性降低之情形。 又，親水性共聚物(A)之甲苯凝膠分率較佳為60～99%。若凝膠分率低於該範圍，則所獲得之印刷版之強度降低，若超過該範圍，則有親水性共聚物(A)與彈性體(B)之混合性明顯降低之傾向。 此處，所謂甲苯凝膠分率，係指將親水性共聚物(A)之約30質量%之分散液適量滴於鐵氟龍片材上，於130℃下乾燥30分鐘，取親水性共聚物(A)0.5 g，使其浸漬於25℃之甲苯30 ml中，使用振盪器振盪3小時後利用320SUS篩網進行過濾，將未通過部分於130℃下乾燥1小時後之質量除以0.5(g)而得之質量分率(%)。 於本實施形態中，所謂(B)彈性體，係於常溫(25℃)下顯示出橡膠彈性之彈性體，例如可列舉：熱塑性嵌段共聚物、聚丁二烯、聚丙烯腈-丁二烯、聚胺基甲酸酯系彈性體等。其中較佳為熱塑性嵌段共聚物。 作為熱塑性嵌段共聚物，較佳為使單乙烯基取代芳香族烴單體與共軛二烯單體進行聚合而獲得者，作為單乙烯基取代芳香族烴單體，可列舉：苯乙烯、α-甲基苯乙烯、對甲基苯乙烯、對甲氧基苯乙烯等，又，作為共軛二烯單體，可使用丁二烯、異戊二烯等。 具體而言，可列舉：苯乙烯-丁二烯-苯乙烯嵌段共聚物、或苯乙烯-異戊二烯-苯乙烯共聚物等。此處，於苯乙烯-丁二烯-苯乙烯嵌段共聚物或苯乙烯-異戊二烯-苯乙烯共聚物中，亦可混合苯乙烯-丁二烯共聚物或苯乙烯-異戊二烯共聚物等二嵌段物。又，亦可為使苯乙烯及丁二烯或異戊二烯於苯乙烯-丁二烯-苯乙烯嵌段共聚物或苯乙烯-異戊二烯-苯乙烯共聚物中之丁二烯部或異戊二烯部上進行無規共聚合而成者。 此處，關於彈性體(B)中之單乙烯基取代芳香族烴單元之含量，於包含一定量之情形時，抑制感光性樹脂組合物之冷流而獲得良好之厚度精度，又，於為一定量以下之情形時，抑制柔版印刷版之硬度而獲得良好之印刷品質，較佳為在8～50質量%之範圍內。 彈性體(B)之共軛二烯片段中之乙烯基鍵結單元雖然有助於提高凸紋之再現性，但同時亦會導致柔版印刷版表面之黏著性提高。就取得該兩特性之平衡之觀點而言，乙烯基鍵結單元之平均比率較佳為5～40莫耳%，作為進而較佳之範圍，為10～35莫耳%。 再者，單乙烯基取代芳香族烴單元及共軛二烯單元之平均含量、或彈性體(B)之共軛二烯片段中之乙烯基鍵結單元之平均比率可藉由IR(Infrared Radiation，紅外線輻射)光譜或NMR(Nuclear Magnetic Resonance，核磁共振)而求出。 相對於親水性共聚物(A)100質量份，彈性體(B)之量較佳為30質量份以上且未達250質量份。更佳為30質量份以上且未達200質量份。進而較佳為50質量份以上且未達170質量份。 若未達30質量份，則有耐印性降低、或具有極性之油墨之膨潤率增加之傾向，又，若為250質量份以上，則有於水系顯影液中之顯影性降低之傾向。 作為本實施形態中所使用之(C)聚合性不飽和單體，可列舉：丙烯酸、甲基丙烯酸、反丁烯二酸及順丁烯二酸等之羧酸酯類，丙烯醯胺或甲基丙烯醯胺之衍生物，烯丙酯，苯乙烯及其衍生物，N取代順丁烯二醯亞胺化合物。 作為其具體之例，可列舉：己二醇、壬二醇等烷烴二醇之二丙烯酸酯及二甲基丙烯酸酯，或乙二醇、二乙二醇、丙二醇、二丙二醇、聚乙二醇、丁二醇之二丙烯酸酯及二甲基丙烯酸酯，或三羥甲基丙烷三丙烯酸酯及三甲基丙烯酸酯，季戊四醇四丙烯酸酯及四甲基丙烯酸酯等，或N,N'-六亞甲基雙丙烯醯胺及甲基丙烯醯胺、苯乙烯、乙烯基甲苯、二乙烯基苯、鄰苯二甲酸二丙烯醯基酯、氰尿酸三烯丙酯、反丁烯二酸二乙酯、反丁烯二酸二丁酯、反丁烯二酸二辛酯、反丁烯二酸二硬脂酯、反丁烯二酸丁基辛酯、反丁烯二酸二苯酯、反丁烯二酸二苄酯、順丁烯二酸二丁酯、順丁烯二酸二辛酯、反丁烯二酸雙(3-苯基丙基)酯、反丁烯二酸二月桂酯、反丁烯二酸二山萮酯、N-月桂基順丁烯二醯亞胺等。 該等可單獨使用，亦可組合使用兩種以上。 相對於親水性共聚物(A)100質量份，聚合性不飽和單體(C)之含量較佳為10質量份以上且未達200質量份。更佳為20質量份以上且未達150質量份，進而較佳為30質量份以上且未達100質量份。若為10質量份以上，則使細小之點或文字之形成性提高，故而較佳。又，若為200質量份以下，則產生如下效果：抑制未硬化版之儲藏、輸送時之變化，所獲得之版之硬度變得適度，向表面具有凹凸之紙質較差之被印刷體之印刷中之實心部分的油墨吸附性變得良好等，故而較佳。 作為於本實施形態中所使用之(D)光聚合起始劑之例，可列舉：二苯甲酮、米其勒酮、安息香、安息香甲醚、安息香乙醚、安息香異丙醚、安息香異丁醚、α-羥甲基安息香、α-羥甲基安息香甲醚、α-甲氧基安息香甲醚、安息香苯醚、α-第三丁基安息香、2,2-二甲氧基苯基苯乙酮、2,2-二乙氧基苯基苯乙酮、二苯基乙二酮、新戊偶姻、蒽醌、苯并蒽醌、2-乙基蒽醌、2-氯蒽醌等。該等可單獨使用，亦可組合使用兩種以上。 作為(D)光聚合起始劑之含量，相對於親水性共聚物(A)100質量份，較佳為0.1質量份以上且未達50質量份。更佳為1質量份以上且未達30質量份。於0.1質量份以上之情形時，使細小之點或文字之形成性提高，故而較佳。又，於50質量份以下之情形時，可確保感光性樹脂組合物之紫外線等之活性光透過率而可維持曝光感度，故而較佳。 於本實施形態中，感光性樹脂組合物可進而含有選自由界面活性劑及具有聚伸烷基二醇鏈之(甲基)丙烯酸酯單體所組成之群中之至少1種化合物(E)。 作為本實施形態中所可使用之化合物(E)之界面活性劑，可列舉：陰離子系界面活性劑、離子性界面活性劑、非離子性界面活性劑、陰離子系反應性界面活性劑、非離子性反應性界面活性劑等。 具體而言，可列舉：聚氧乙烯苯乙烯化苯醚硫酸鈉、聚氧伸烷基支鏈癸醚硫酸鈉、聚氧乙烯異癸醚硫酸銨、聚氧乙烯十三烷基醚硫酸鈉、聚氧乙烯月桂醚硫酸鈉、聚氧乙烯月桂醚硫酸銨、聚氧乙烯烷基醚硫酸鈉、聚氧乙烯油基鯨蠟醚硫酸銨、聚氧乙烯油基鯨蠟醚硫酸鈉、聚氧乙烯十三烷基醚磷酸酯、聚氧乙烯烷基(C2～C16)醚磷酸酯、聚氧乙烯烷基(C2～C16)醚磷酸酯-單乙醇胺鹽、烷基(C2-C16)磷酸酯鈉、烷基(C2-C16)磷酸酯-單乙醇胺鹽、月桂基磺基琥珀酸二鈉、聚氧乙烯磺基琥珀酸月桂基二鈉、聚氧乙烯烷基(C2-C20)磺基琥珀酸二鈉、直鏈烷基苯磺酸鈉、直鏈烷基苯磺酸、α-烯烴磺酸鈉、苯酚磺酸、二辛基磺基琥珀酸鈉、月桂基硫酸鈉、高級脂肪酸鉀鹽等陰離子系界面活性劑；氯化烷基(C8-C20)三甲基銨、氯化烷基(C8-C20)二甲基乙基銨、氯化二癸基二甲基銨、氯化月桂基二甲基苄基銨、硬脂基二甲基羥基乙基銨對甲苯磺酸鹽、硬脂基二甲基胺基丙基醯胺、氯化三丁基苄基銨、月桂基二甲基胺基乙酸甜菜鹼、月桂醯胺丙基甜菜鹼、椰油脂肪醯胺丙基甜菜鹼、辛醯胺丙基甜菜鹼、月桂基二甲基氧化胺等離子性界面活性劑；聚氧伸烷基十三烷基醚、聚氧乙烯異癸醚、聚氧伸烷基月桂醚、聚氧伸烷基烷基醚、聚氧伸烷基醚與聚醚多元醇之混合物、聚醚多元醇、聚氧乙烯磺化苯醚、聚氧乙烯萘醚、苯氧基乙醇、聚氧乙烯苯醚、聚氧乙烯聚氧丙二醇、聚氧乙烯月桂醚、聚氧乙烯油基鯨蠟醚、聚氧乙烯油酸酯、聚氧乙烯二硬脂酸酯、異硬脂酸聚氧乙烯甘油酯、聚氧乙烯氫化蓖麻油、椰油脂肪酸二乙醇醯胺、聚氧乙烯烷基胺、山梨醇酐三油酸酯、山梨醇酐倍半油酸酯、山梨醇酐單油酸酯、山梨醇酐單椰油酸酯、山梨醇酐單癸酸酯、聚氧乙烯山梨醇酐單椰油酸酯、聚氧乙烯山梨醇酐單硬脂酸酯、聚氧乙烯山梨醇酐單油酸酯、辛基聚糖苷、丁基聚糖苷、蔗糖苯甲酸酯、蔗糖乙酸酯、蔗糖脂肪酸酯等之非離子性界面活性劑；聚氧乙烯-1-(烯丙氧基甲基)烷基醚硫酸銨、聚氧乙烯壬基丙烯基苯醚硫酸銨等陰離子系反應性界面活性劑；聚氧乙烯壬基丙烯基苯醚等非離子性反應性界面活性劑等。 又，作為本實施形態中所可使用之化合物(E)之具有聚伸烷基二醇鏈之(甲基)丙烯酸酯單體，作為具有聚伸烷基二醇之單體，可列舉：以2以上且20以下之範圍包含乙二醇鏈之聚乙二醇單(丙烯酸酯)、聚乙二醇二(甲基)丙烯酸酯，以2以上且20以下之範圍包含丙二醇鏈之聚乙二醇單(甲基)丙烯酸酯、聚丙二醇二(甲基)丙烯酸酯，分別以2至20之範圍包含聚乙二醇鏈及/或聚丙二醇鏈之聚乙二醇聚丙二醇二(甲基)丙烯酸酯、甲苯基聚乙二醇(甲基)丙烯酸酯、壬基苯氧基聚乙二醇(甲基)丙烯酸酯等。 化合物(E)之界面活性劑或具有聚伸烷基二醇鏈之(甲基)丙烯酸酯單體可單獨使用，亦可組合兩種以上。 該等上述化合物(E)之中，較佳為非離子性界面活性劑、非離子性反應性界面活性劑、具有聚伸烷基二醇鏈之(甲基)丙烯酸酯單體。 相對於親水性共聚物(A)100質量份，化合物(E)之含量較佳為0.1質量份以上且未達15質量份。更佳為0.5質量份以上且未達10質量份。於未達0.1質量份之情形時，有於水系顯影液中之顯影性降低之傾向，於15質量份以上之情形時，有所獲得之樹脂組合物之霧度變高，或顯影後之乾燥時間延長，或對於水系油墨之耐溶劑性降低之傾向。 於本實施形態中，感光性樹脂組合物可進而含有塑化劑成分(F)。 作為塑化劑成分(F)，可列舉：環烷油、烷烴油等烴油，液狀聚丁二烯、液狀聚異戊二烯、液狀聚丁二烯之末端改性物、液狀丙烯腈-丁二烯共聚物、液狀丙烯腈-丁二烯共聚物之羧酸改性物、液狀苯乙烯-丁二烯共聚物、數量平均分子量2,000以下之聚苯乙烯、癸二酸酯、鄰苯二甲酸酯、羧酸改性丙烯酸系聚合物等。 其中，較佳為液狀聚丁二烯、經OH基或羧基等進行改性而成之液狀聚丁二烯之末端改性物、液狀丙烯腈-丁二烯共聚物、液狀丙烯腈-丁二烯共聚物之羧酸改性物、液狀苯乙烯-丁二烯共聚物、羧酸改性丙烯酸系聚合物。 若使用液狀聚丁二烯、液狀聚丁二烯之末端改性物、液狀丙烯腈-丁二烯共聚物、液狀丙烯腈-丁二烯共聚物之羧酸改性物、液狀苯乙烯-丁二烯共聚物、羧酸改性丙烯酸系聚合物作為塑化劑成分(F)，則提高混練成型性及顯影性，並且塑化劑成分(F)容易混合至彈性體(B)中，藉此耐印性提高，故而較佳。 作為塑化劑成分(F)相對於親水性共聚物(A)100質量份之量，較佳為1質量份以上且未達250質量份，更佳為10質量份以上且未達220質量份，進而較佳為20質量以上且未達200質量份。於未達1質量份之情形時，有成型後之硬化收縮增大之傾向，於250質量份以上之情形時，有冷流性變差之傾向。 除此以外，於本實施形態之柔版印刷用感光性樹脂組合物中，除了可添加上述必需或任意成分以外，可進而視需要而添加各種輔助添加成分、例如熱聚合防止劑、紫外線吸收劑、防暈光劑、光穩定劑等。 於本實施形態中，柔版印刷用感光性樹脂組合物較佳為具有包含親水性共聚物(A)之相自其他相分離之結構，具體而言，至少其一部分採取如下結構，即，包含親水性共聚物(A)之相為島且其他相為海般之所謂海島結構。 於本實施形態中，於對柔版印刷用感光性樹脂組合物之硬化物之剖面進行觀察時，於該樹脂組合物之硬化物之剖面中，包含上述親水性共聚物(A)之相所占之比率(面積率)SA 為15%以上且未達60%，且於包含上述親水性共聚物(A)之相之中，相面積為3 μm2 以上且未達100 μm2 者之比率成為20(面積%)以上。 尤其於對感光性樹脂組合物之硬化物之30 μm見方之剖面進行觀察時，較佳為於該30 μm見方之剖面中，包含上述親水性共聚物(A)之相所占之比率SA 為15%以上且未達60%，於包含上述親水性共聚物(A)之相之中，相面積為3 μm2 以上且未達100 μm2 者之比率為20(面積%)以上。 感光性樹脂組合物中之包含親水性共聚物(A)之相之分散狀態可藉由切出感光性樹脂組合物之硬化物之薄膜切片，並對其進行觀察而確認。 再者，關於感光性樹脂組合物中之包含親水性共聚物(A)之相之中相面積為3 μm2 以上且未達100 μm2 者之比率，於未硬化物、硬化物中均無變化，亦可對未硬化物之剖面以與硬化物之剖面相同之方式進行觀察，但由於未硬化物存在液狀之未硬化物滲出之情形，故而較佳為觀測硬化物之剖面。 觀察方法並無限定，例如可藉由穿透式顯微鏡(TEM)觀察、利用氧化鋨或磷鎢等進行薄膜切片染色後之掃描式顯微鏡(SEM)觀察、或利用原子力顯微鏡(AFM)之掃描探針顯微鏡(SPM)之相位模式等進行之觀察等而進行觀察。其中，利用原子力顯微鏡(AFM)之掃描探針顯微鏡(SPM)之相位模式等進行之測定無需試樣之染色等，僅藉由自樹脂組合物中切出薄膜切片便可簡易地進行測定，而且藉由各相之硬度之相對比較而可容易地將包含親水性共聚物(A)之相與其他相分離，故而較佳。SPM測定係於硬化前之樹脂組合物及硬化後之樹脂組合物兩者中均可進行，但存在因硬化過程之聚合性不飽和單體(C)之聚合而各相之相對硬度發生逆轉之情形。於本實施形態之樹脂組合物中，包含親水性共聚物(A)之相於硬化前之樹脂組合物中較其他相柔軟，於硬化後之樹脂組合物中逆轉為較其他相硬之相。 具體而言，包含親水性共聚物(A)之相所占之比率(面積率)SA 、或於包含親水性共聚物(A)之相中之相面積為3 μm2 以上且未達100 μm2 者之比率能夠以如下方式求出。 藉由上述利用原子力顯微鏡之SPM相位模式進行之觀察而獲得30 μm見方(30 μm square)之圖像。根據所獲得之圖像，根據表示相對之硬度資訊之相位差進行圖像處理(二值化)，將包含親水性共聚物(A)之相及其他相(包含彈性體(B)之相)分離，對包含親水性共聚物(A)之各相求出面積，根據其合計(包含親水性共聚物(A)之相之總面積)而求出包含親水性共聚物(A)之相於樹脂組合物之硬化物之剖面中所占之比率SA (面積%)。(具體而言，求出上述總面積相對於觀察面積(900 μm2 )之面積率) 又，根據包含親水性共聚物(A)之各相之面積而製作直方圖(例如將0 μm2 作為起始值之1 μm2 刻度之直方圖)。根據該直方圖，可求出相面積為3 μm2 以上且100 μm2 以下之包含親水性共聚物(A)之相之面積和相對於包含親水性共聚物(A)之相之總面積的比率(%)。 於本實施形態中，於柔版印刷用感光性樹脂組合物之硬化物或未硬化物之剖面中，包含親水性共聚物(A)之相所占之比率(面積率)SA 為15%以上且未達60%，更佳為25%以上且55%以下，進而較佳為25%以上且50%以下。 於包含親水性共聚物(A)之相之比率SA 未達15%之情形時，有於水系顯影液中之顯影速度變慢之傾向，於60%以上之情形時，有耐印性降低之傾向。 於本實施形態中，根據藉由上述方法進行之測定與圖像處理而獲得之包含親水性共聚物(A)之相之中相面積為3 μm2 以上且未達100 μm2 者之比率為20(面積%)以上，較佳為30(面積%)以上，更佳為40(面積%)以上，進而較佳為50(面積%)以上。 根據本發明者等人之研究判明，藉由包含親水性共聚物(A)之相之中，相面積為3 μm2 以上且未達100 μm2 之相所占之比率在上述範圍內，包含親水性共聚物(A)與彈性體(B)之相充分混合，藉此可於將耐印性或版特性保持為較高之狀態下，提高於水系顯影液中之顯影性。 可認為，若相面積為3 μm2 以上且未達100 μm2 之相所占之比率較高，則可提高於水系顯影液中之顯影性之原因在於：若包含親水性共聚物(A)之相較小，則可成為顯影之起始點之包含親水性共聚物(A)之相與其他相之界面增加。然而，即便包含親水性共聚物(A)之相過小，顯影性亦降低。其原因雖然尚不明確，但認為其一個原因為，若包含親水性共聚物(A)之相過小，則於水系顯影液中利用毛刷等機械構件削除時，成為毛刷等之起點之部分較小，結果顯影性降低。 另一方面推測，於包含親水性共聚物(A)之相過大之情形時，雖然容易利用毛刷等削除，但於製成印刷版時，耐磨耗性較其他相差之包含親水性共聚物(A)之相增大，由此容易引起印刷版之磨耗或缺損，結果耐印性會降低。 然而，本發明之效果之機理並不限定於該等推定。 於本實施形態中，較佳為於樹脂組合物之硬化物之剖面中包含親水性聚合物(A)之相所占之比率SA (面積%)、與上述樹脂組合物中之親水性共聚物(A)之質量比率WA (質量%)之比SA /WA 為1.35以上。 樹脂組合物中之親水性共聚物(A)之質量比率WA 表示親水性共聚物(A) 之質量相對於樹脂組合物之質量的比率(質量%)。SA /WA 較佳為1.35以上，更佳為1.40以上，進而較佳為1.50以上。於SA /WA 為1.35以上時，可提高於水系顯影液中之顯影性。 於本實施形態中，聚合性不飽和單體(C)較佳為包含於柔版印刷用感光性樹脂組合物之包含親水性共聚物(A)之相中。由於親水性共聚物(A)為聚合物粒子，故而若聚合性不飽和單體(C)係包含於包含親水性共聚物(A)之相中，則聚合性不飽和單體(C)將親水性共聚物(A)之聚合物粒子彼此連接，藉此可提高製版後之版之耐印性。 再者，於包含親水性共聚物(A)之相中含有聚合性不飽和單體(C)係由以下情況而確認：於藉由SPM之相位模式進行之測定中，於未硬化時，包含親水性共聚物(A)之相較包含彈性體(B)之相柔軟，且於光硬化後，包含親水性共聚物(A)之相係以較包含彈性體(B)之相硬 之相之形式而被觀察到。 於本實施形態中，對柔版印刷用感光性樹脂組合物之製造方法並無限定。 於親水性共聚物(A)係以水分散液(乳膠)之形態而獲得之情形時，較佳為藉由各種方法去除水後使用。例如，於使用硫酸鹽、硝酸鹽、鹽酸鹽、碳酸鹽、羧酸鹽等凝聚劑使親水性共聚物(A)凝固後，藉由離心分離等脫水步驟自含親水性共聚物(A)之水分散液中去除某程度之水，其後，可視需要與塑化劑成分(F)、界面活性劑等化合物(E)、穩定劑等混合後進行乾燥，亦可視需要與塑化劑成分(F)、界面活性劑等化合物(E)、穩定劑等混合後，藉由蒸餾等自含親水性共聚物(A)之水分散液中去除水。 若於含親水性共聚物(A)之水分散液中，與塑化劑成分(F)、界面活性劑等化合物(E)及穩定劑等化合物混合後藉由蒸餾等去除水，則可使塑化劑成分(F)、界面活性劑等化合物(E)及穩定劑等均勻地分散於親水性共聚物(A)中，於製成印刷版時之圖像形成時不會產生物性差，故而較佳。 作為藉由蒸餾等去除水之方法，可使用捏合機、圓錐螺旋混合機、螺帶式混合機等批次式乾燥機，亦可使用脫揮擠出機、薄膜蒸餾機、CD乾燥器、KRC捏合機、SC處理機等連續式乾燥機。 以上述方式獲得親水性共聚物(A)、或親水性共聚物(A)與視需要添加之塑化劑成分(F)、界面活性劑等化合物(E)、及穩定劑等之至少1種以上之混合物之乾燥物後，與彈性體(B)、聚合性不飽和單體(C)或光聚合起始劑(D)一併使用擠出機、班布里攪拌機、捏合機等各種公知之混練裝置進行混練，藉此可製備感光性樹脂組合物。 於本實施形態中，為了將於柔版印刷用感光性樹脂組合物之硬化物或未硬化物之剖面中，包含親水性共聚物(A)之相中之相面積為3 μm2 以上且未達100 μm2 之相所占的比率設為20(面積%)以上，例如較佳為於樹脂組合物混練時，於使用擠出機之情形時控制螺桿樣式或螺桿轉速，於使用批次式混練機之情形時控制轉速或混練時間等，而調整混練狀態，或向親水性共聚物(A)中預先添加化合物(E)或塑化劑成分(F)後與其他成分混合，或進而於以水分散液之形態供給親水性共聚物(A)之情形時，控制殘留於親水性共聚物(A)中之水分之量，藉此控制包含親水性共聚物(A)之相之分散狀態。 於本實施形態中，尤佳為藉由依序包括以下所記載之步驟1～3之方法而獲得柔版印刷用感光性樹脂組合物。 1.於含親水性共聚物(A)之水分散液中，添加選自由界面活性劑及具有聚伸烷基二醇鏈之(甲基)丙烯酸酯單體所組成之群中之至少1種化合物(E)及/或塑化劑成分(F)之步驟； 2.自上述含親水性共聚物(A)之水分散液中去除水之步驟；及 3.於步驟2中所獲得之包含親水性共聚物(A)之混合物中，添加彈性體(B)、聚合性不飽和單體(C)、及光聚合起始劑(D)，並進行混練之步驟。 於本實施形態中，柔版印刷原版至少包含本實施形態之感光性樹脂組合物、或具有含有感光性樹脂組合物之感光層。感光層例如可藉由如下方法而形成：藉由熱壓成型或壓延處理或擠出成型等將感光性樹脂組合物成形為所需厚度之層。 柔版印刷原版為了維持作為印刷版之精度，亦可製成於聚酯等支持體上設有感光層之積層體。 又，亦可於感光層之與支持體為相反之面上，設置用以對感光層直接進行描繪之紅外線剝蝕層、或用以使與負像膜之接觸性變得良好及用以可進行負像膜之再利用的可進行水系顯影之可撓性膜層(亦稱為透明圖像載體層、防黏著層)。 支持體或紅外線剝蝕層、可撓性膜層例如可於將感光層成型為片狀後，藉由輥層壓而密接於感光層。於層壓後，亦可進而進行加熱壓製，提高感光層之表面精度。 於本實施形態中，作為用以使柔版印刷原版之感光層進行光硬化(進行潛像形成)之活性光線源，例如可列舉：低壓水銀燈、高壓水銀燈、紫外線螢光燈、碳弧燈、氙氣燈、鋯燈、太陽光等。 於本實施形態中，通過描繪後之紅外線剝蝕層或透明圖像載體對感光層進行光照射而形成潛像後，使用水系顯影液將未照射部分去除(顯影)，藉此可獲得凸紋(印刷版)。 水系顯影液為以水作為主成分之顯影液，可為水本身，或例如亦可為於水中調配非離子性、陰離子性等之界面活性劑及視需要之pH值調整劑、洗淨促進劑等而成者。 作為非離子性界面活性劑之具體例，可列舉：聚氧伸烷基烷基或烯基醚、聚氧伸烷基烷基或烯基苯醚、聚氧伸烷基烷基或烯基胺、聚氧伸烷基烷基或烯基醯胺、環氧乙烷/環氧丙烷嵌段加成物等。 作為陰離子性界面活性劑之具體例，可列舉：具有平均碳數8～16之烷基之直鏈烷基苯磺酸鹽、平均碳數10～20之α-烯烴磺酸鹽、烷基或烯基之碳數為4～10之二烷基磺基琥珀酸鹽、脂肪酸低級烷基酯之磺酸鹽、平均碳數10～20之烷基硫酸鹽、具有平均碳數10～20之直鏈或分支鏈之烷基或者烯基且加成有平均0.5～8莫耳之環氧乙烷之烷基醚硫酸鹽、平均碳數10～22之飽和或不飽和脂肪酸鹽等。 又，作為pH值調整劑，有硼酸鈉、碳酸鈉、矽酸鈉、偏矽酸鈉、琥珀酸鈉、乙酸鈉等。就容易溶解於水中之方面而言，較佳為矽酸鈉。 進而，於顯影液中亦可添加洗淨助劑。所謂洗淨助劑，係藉由與上述界面活性劑、pH值調整劑併用而提高顯影液之洗淨(顯影)能力者。作為具體例，可列舉：單乙醇胺、二乙醇胺、三乙醇胺等胺類，氫氧化四甲基銨等銨鹽類，鏈烷系烴等。 該等例如可於顯影液中以0.1～50質量%、較佳為1～10質量%之範圍添加混合而使用。 於顯影時，可輔助地利用超音波等對印刷原版施加振動，或使用毛刷等機械構件摩擦印刷原版之表面。 顯影後之印刷版較佳為於烘箱中例如於50℃下進行15～120分鐘乾燥。 包含本實施形態之感光性樹脂組合物之感光層根據其組成而存在乾燥結束後亦於版表面殘留黏連感之情形。於該情形時，可藉由公知之表面處理方法去除黏連感。作為此種表面處理方法，較理想為利用波長300 nm以下之活性光線進行之曝光處理。 [實施例] 以下藉由實施例具體地說明本發明，但本發明並不受該等之限定。 ＜製造例1：實施例1～8、10與比較例1～2中所使用之包含塑化劑成分(F)之含親水性共聚物(A)之混合物的合成＞ 於安裝有攪拌裝置與溫度調節用套管之耐壓反應容器中，初期添加水125質量份、作為反應性乳化劑之(α-磺基(1-壬基苯氧基)甲基-2-(2-丙烯氧基)乙氧基-聚(氧基-1,2-乙二基)之銨鹽「ADEKA REASOAP」(旭電化工業製造)2質量份，將內溫升溫至80℃，分別歷時5小時及6小時以一定之流速添加包含苯乙烯10質量份、丁二烯60質量份、丙烯酸丁酯23質量份、甲基丙烯酸5質量份及丙烯酸2質量份之單體混合物與第三-十二烷基硫醇2質量份之油性混合液，及包含水28質量份、過氧二硫酸鈉1.2質量份、氫氧化鈉0.2質量份、及(α-磺基(1-壬基苯氧基)甲基-2-(2-丙烯氧基)乙氧基-聚(氧基-1,2-乙二基)之銨鹽2質量份之水溶液。 繼而，於該狀態下將80℃之溫度保持1小時，完成聚合反應後進行冷卻。進而，對所生成之共聚物乳膠利用氫氧化鈉將pH值調整為7後，藉由蒸汽汽提法去除未反應之單體，利用200目之金屬篩網進行過濾，最終以濾液之固形物成分濃度成為40質量%之方式調整而獲得親水性共聚物(A)之水分散液。 又，相對於該水分散液中所含之親水性共聚物(A)100質量份，一面混合作為塑化劑成分(F)之液狀聚丁二烯[LBR352：可樂麗製造]10質量份，一面於80℃下進行減壓乾燥，獲得親水性共聚物(A)與塑化劑成分(F)之混合乾燥物。 ＜製造例2：實施例9中所使用之包含塑化劑成分(F)之含親水性共聚物(A)之混合物的合成＞ 使用作為非反應性乳化劑之十二烷基苯磺酸鈉代替反應性乳化劑，除此以外，以與製造例1相同之方式獲得實施例9中所使用之親水性共聚物(A)之水分散液。使用其以與製造例1相樣之方式獲得親水性共聚物(A)與塑化劑(F)之混合乾燥物。 ＜製造例3：於實施例11中所使用之包含塑化劑成分(F)之含親水共聚物(A)之混合物的合成＞ 以與製造例1相同之方式獲得親水性共聚物(A)之水分散液後，相對於該水分散液中所含之親水性共聚物100質量份，添加將作為塑化劑成分(F)之液狀聚丁二烯[LBR352]10質量份及液狀丙烯腈-丁二烯共聚物(NBR)之羧基改性物[DN-601：日本Zeon製造]5質量份混合而成之溶液，一面混合一面於80℃下進行減壓乾燥，獲得親水性共聚物(A)與塑化劑(F)之混合乾燥物。 ＜製造例4：實施例12中所使用之包含化合物(E)及塑化劑成分(F)之含親水共聚物(A)之混合物的合成＞ 以與製造例1相同之方式獲得親水性共聚物(A)之水分散液後，相對於該水分散液中所含之親水性共聚物100質量份，添加將作為選自由界面活性劑及具有聚伸烷基二醇鏈之(甲基)丙烯酸酯單體所組成之群中之至少1種化合物(E)的非離子系界面活性劑[XL-100：第一工業製藥製造]3質量份、作為塑化劑成分(F)之液狀聚丁二烯[LBR352]10質量份及液狀丙烯腈-丁二烯共聚物(NBR)之羧基改性物)[DN-601：日本Zeon製造]5質量份混合而成之溶液，一面混合一面於80℃下進行減壓乾燥，獲得親水性共聚物(A)、化合物(E)及塑化劑成分(F)之混合乾燥物。 ＜製造例5：於實施例13中所使用之包含化合物(E)及塑化劑(F)之含親水共聚物(A)之混合物的合成＞ 以與製造例1相同之方式獲得親水性共聚物(A)之水分散液後，相對於該水分散液中所含之親水性共聚物100質量份，添加將作為選自由界面活性劑及具有聚伸烷基二醇鏈之(甲基)丙烯酸酯單體所組成之群中之至少1種化合物(E)的非離子系界面活性劑[XL-100：第一工業製藥製造]3質量份、作為塑化劑成分(F)之液狀聚丁二烯[LBR352]10質量份及液狀羧酸改性丙烯酸系聚合物[CBB-3098：綜研化學製造]5質量份混合而成之溶液，一面混合一面於80℃下進行減壓乾燥，獲得親水性共聚物(A)、化合物(E)及塑化劑成分(F)之混合乾燥物。 ＜製造例6：實施例14及比較例3中所使用之親水性共聚物(A)的合成＞ 以與製造例1相同之方式獲得親水性共聚物(A)之水分散液後，不添加液狀聚丁二烯，直接於80℃下進行減壓乾燥，獲得親水性共聚物(A)之乾燥物。 ＜製造例7：紅外線剝蝕層之製作＞ 將作為具有羧酸基作為陰離子性極性官能基之陰離子性聚合物之乙烯-丙烯酸共聚物[SG-2000：鉛市製造，20質量%水溶液]10質量份、碳黑[BONJET CW-2：Orient Chemical Industries製造，20質量%水溶液]5質量份、脫模劑[KF-351：信越化學工業製造]0.05質量份、水30質量份、乙醇15質量份混合，獲得剝蝕層形成用之塗佈溶液。 將該剝蝕層形成用之塗佈溶液以乾燥後之膜厚成為3 μm之方式塗佈於成為覆蓋膜之約100 μm之厚度的PET膜上，於90℃下實施2分鐘之乾燥處理，而獲得剝蝕層與覆蓋膜之積層體。 (實施例1) (1)感光性樹脂組合物之製造 使用加壓捏合機將製造例1中所獲得之包含親水性共聚物(A)與塑化劑成分(F)之混合物110質量份、苯乙烯-丁二烯-苯乙烯共聚物[D-KX405：CLAYTONE製造]75質量份於140℃下混合後，歷時15分鐘逐次少量添加液狀聚丁二烯[LBR-352：可樂麗製造]120質量份、1,9-壬二醇二丙烯酸酯20質量份、1,6-己二醇二甲基丙烯酸酯20質量份、2,2-二甲氧基苯基苯乙酮5質量份、界面活性劑[XL-100：第一工業製藥製造]3質量份、及2,6-二-第三丁基-對甲酚5質量份之混合物，添加結束後進而混練20分鐘，獲得感光性樹脂組合物。 (2)印刷原版之製造 取出上述組合物，夾入至塗佈有含彈性體之接著劑之厚度100 μm之聚酯膜(以下簡稱為PET)、與塗佈有厚度5 μm之聚乙烯醇(PVA)層之厚度100 μm之PET之間，使用經加熱至120℃之壓製機而成型為厚度1.14 mm之板狀，繼而將塗佈有PVA層之PET剝離，獲得包含支持體(PET)-感光層之積層體。 對於所獲得之積層體，以與感光層接觸之方式層壓製造例7中所獲得之積層有覆蓋膜之紅外線剝蝕層，獲得印刷原版。 (3)印刷版之製造 自印刷原版之支持體(塗佈有接著劑之PET)之側，以硬化後之圖案高度(RD)成為0.6 mm左右之方式使用紫外線曝光機(日本電子精機製造之JE-A2-SS)進行曝光。 其次，將紅外線剝蝕層之覆蓋膜剝離，使用ESKO製造之雷射描繪機(CDI(Cyrel Digital Imager，Cyrel數位成像器))對紅外線剝蝕層進行描繪後，自紅外線剝蝕層之側利用上述曝光機曝光10分鐘。 曝光後，製備NISSAN SOAP 1%之水溶液(水系顯影液)，使用日本電子精機製造之洗淨機(JOW-A3-P)，於40℃下進行洗淨(顯影)，去除未曝光部。再者，關於洗淨時間，預先將未曝光之印刷原版洗淨5分鐘並測定被削去之厚度d(mm)，根據所需之圖案高度(RD＝0.6(mm))計算RD×d/5×1.5(分)，作為該時間。 乾燥後，利用紫外線殺菌燈、紫外線化學燈進行後曝光，獲得印刷版。 (4)評價 (a)感光性樹脂組合物中之包含親水性共聚物(A)之相之分散狀態的評價 將感光性樹脂組合物夾於經剝離處理之2片PET膜間，於120℃下利用壓製機獲得厚度1 mm之片狀之成形品。自該片狀成形品之兩面使用紫外線曝光機(日本電子精機製造之JE-A2-SS)之高壓水銀燈分別以7500 mJ進行曝光。再者，高壓水銀燈之曝光量係於波長365 nm下所測得之值。 其次自曝光後之成形品之中央部於片材中水平地切出小片，利用冷凍薄片切片機形成切削麵，獲得觀察用試樣之薄膜切片。 使用Bruker公司製造之原子力顯微鏡(AFM)[Dimension Icon]之掃描探針顯微鏡(SPM)，對薄膜切片之剖面之30 μm見方進行觀察。觀察時，選擇輕敲(Tapping)模式，並使用長度125 μm、寬度40 μm、厚度4 μm之Si製矩形型懸臂作為懸臂。該懸臂係由Bruker公司以NCHV之型號而銷售者，彈簧常數為40 N/m左右。 資料處理係使用Dimension Icon附屬之資料處理軟體Nanoscope Analysis Ver 1.40進行。如圖1般顯示相位像，藉由平面擬合(Plane fit)處理將圖像整體之失真修正後，藉由平化(Flatten)處理，使表示包含親水性共聚物(A)之相之明亮區域均一化。 其次，藉由粒子分析(Particle Analysis)，以圖像處理(二值化)後圖像中之包含親水共聚物(A)之相之像與圖像處理前之相位像實質上一致之方式，一面藉由目測確認一面決定閾值而進行圖像處理，如圖2所示，分離成包含親水共聚物(A)之相與包含彈性體(B)之相，求出包含親水性共聚物(A)之相之30 μm見方中之面積率SA 。又，對包含親水性共聚物(A)之各相測定相面積，並製作直方圖。根據該直方圖，算出相面積為3 μm2 以上且未達100 μm2 之相之面積和相對於包含親水性共聚物(A)之相之總面積的比率(%)。 (b)印刷原版之洗淨性(水顯影性)之評價 於日本電子精機製造之洗淨機(JOW-A3-P)中填充NISSAN SOAP 1%水溶液，將(2)中所獲得之印刷原版之紅外線剝蝕層之覆蓋膜剝離，並於40℃下洗淨(顯影)5分鐘。 將被削去0.2 mm以上之情形評價為○，將被削去之量為0.2 mm以下之情形評價為×。 (c)印刷版之耐溶劑性之評價 作為用以評價印刷版對水性油墨之耐性之耐溶劑性試驗，將(3)中所獲得之印刷版模擬地於10%異丙醇水溶液中於23℃下浸漬24小時，測定質量增加率(水膨潤率)(%)。 若質量增加率未達2%則評價為○，若為2%以上則評價為×。 (d)印刷版之耐印性之評價 為了評價印刷版之版面之強度(耐印性)，模擬地使用磨耗輪(TESTER SANGYO製造之TABER磨耗試驗機、硬質磨耗輪)進行耐磨耗試驗。 以與(2)相同之方式製作整個面實心部之印刷版，將所獲得之印刷版於代替水性油墨之10%異丙醇水溶液中浸漬16小時後，測定使用磨耗輪旋轉1000次後之版面之磨耗量(mg/cm2 )。再者，磨耗量係將印刷版之質量之減少部分(mg)除以磨耗輪與實心部接觸之面積(cm2 )而求出。 將磨耗量為10 mg/cm2 以上之情形評價為×，將未達其之情形評價為○。 (e)印刷原版之透明性(霧度)評價 利用2片經脫模處理之厚度100 μm之PET膜夾持感光性樹脂組合物，利用經加熱至120℃之壓製機而成型為3 mm厚度之板。 使用日本電色工業公司製造之霧度計(NDH-5000)，測定於未硬化狀態下成型為3 mm厚之板之霧度。將霧度為20以下評價為○，將超過20且未達50評價為△，將50以上評價為×。 (f)吸濕前後之圖像再現性評價 使用(3)中所製作之印刷版(吸濕前)、及將(2)中所製作之印刷原版於40℃濕度80%之恆溫槽中保管1週後以與(3)相同之方式製作之印刷版(吸濕後)，對500 μm之中空線寬及深度進行比較。將吸濕前後之線寬及深度之差未達5%之情形評價為○，將5%以上且未達10%之情形評價為△，將10%以上之情形評價為×。 (實施例2-5、7、10) 變更彈性體(B)、聚合性不飽和單體(C)、化合物(E)、後續混合之液狀聚丁二烯之添加量，除此以外，以與實施例1相同之方式獲得表1所示之組成之感光性樹脂組合物、以及包含該感光性樹脂組合物之柔版印刷用原版及印刷版。 將所獲得之感光性樹脂組合物、印刷原版及印刷版之評價結果示於表2。 (實施例6、8) 變更聚合性不飽和單體(C)、化合物(E)、後續混合之塑化劑成分(F)(液狀聚丁二烯)之添加量，進而使用聚乙二醇二甲基丙烯酸酯(14G，新中村化學製造) 作為化合物(E)，除此以外，以與實施例1相同之方式獲得表1所示之組成之感光性樹脂組合物、以及包含該感光性樹脂組合物之柔版印刷用原版及印刷版。 將所獲得之感光性樹脂組合物、印刷原版及印刷版之評價結果示於表2。 (實施例9) 使用製造例2中所獲得之包含親水性共聚物(A)與塑化劑成分(F)之混合物代替製造例1中所獲得之混合物，除此以外，以與實施例1相同之方式獲得感光性樹脂組合物、以及包含該感光性樹脂組合物之柔版印刷原版及印刷版。 將所獲得之感光性樹脂組合物、印刷原版及印刷版之評價結果示於表2。 (實施例11) 使用加壓捏合機將製造例3中所獲得之包含親水性共聚物(A)與塑化劑成分(F)之混合物115質量份、苯乙烯-丁二烯-苯乙烯共聚物[D-KX405：CLAYTONE製造]100質量份於140℃下混合後，保持該狀態下歷時15分鐘逐次少量添加液狀聚丁二烯[LBR-352：可樂麗製造]90質量份、1,9-壬二醇二丙烯酸酯20質量份、1,6-己二醇二甲基丙烯酸酯20質量份、2,2-二甲氧基苯基苯乙酮5質量份、界面活性劑[XL-100：第一工業製藥製造]3質量份、及2,6-二-第三丁基-對甲酚5質量份之混合物，添加結束後進而混練20分鐘，獲得感光性樹脂組合物。 使用該感光性樹脂組合物，以與實施例1相同之方式獲得柔版印刷用原版及印刷版。 (實施例12) 使用加壓捏合機，於製造例4中所獲得之包含親水性共聚物(A)與塑化劑成分(F)之混合物118質量份中，於140℃下混合苯乙烯-丁二烯-苯乙烯共聚物[D-KX405：CLAYTONE製造]100質量份後，保持該狀態歷時15分鐘逐次少量添加液狀聚丁二烯[LBR-352：可樂麗製造]90質量份、1,9-壬二醇二丙烯酸酯20質量份、1,6-己二醇二甲基丙烯酸酯20質量份、2,2-二甲氧基苯基苯乙酮5質量份、及2,6-二-第三丁基-對甲酚5質量份之混合物，添加結束後進而混練20分鐘，獲得感光性樹脂組合物。 使用該感光性樹脂組合物，以與實施例1相同之方式獲得柔版印刷用原版及印刷版。 (實施例13) 使用加壓捏合機，於製造例5中所獲得之包含親水性共聚物(A)與塑化劑成分(F)之混合物118質量份中，於140℃下混合苯乙烯-丁二烯-苯乙烯共聚物[D-KX405：CLAYTONE製造]100質量份後，保持該狀態歷時15分鐘逐次少量添加液狀聚丁二烯[LBR-352：可樂麗製造]90質量份、1,9-壬二醇二丙烯酸酯20質量份、1,6-己二醇二甲基丙烯酸酯20質量份、2,2-二甲氧基苯基苯乙酮5質量份、及2,6-二-第三丁基-對甲酚5質量份之混合物，添加結束後進而混練20分鐘，獲得感光性樹脂組合物。 使用該感光性樹脂組合物，以與實施例1相同之方式獲得柔版印刷用原版及印刷版。 (實施例14) 將製造例6中所獲得之親水性共聚物(A)之乾燥物100質量份、苯乙烯-丁二烯-苯乙烯共聚物[D-KX405：CLAYTONE製造]75質量份、液狀聚丁二烯[LBR-352：可樂麗製造]75質量份、1,9-壬二醇二丙烯酸酯20質量份、1,6-己二醇二甲基丙烯酸酯20質量份、2,2-二甲氧基苯基苯乙酮5質量份、界面活性劑[XL-100：第一工業製藥製造]3質量份、及2,6-二-第三丁基-對甲酚5質量份之混合物同時添加至加壓捏合機中，混練300分鐘，獲得感光性樹脂組合物。 使用該感光性樹脂組合物，以與實施例1相同之方式獲得柔版印刷用原版及印刷版。 將所獲得之感光性樹脂組合物、印刷原版及印刷版之評價結果示於表2。 (比較例1) 使用加壓捏合機將使製造例1中所獲得之親水性共聚物(A)之水分散液乾燥所得者110質量份、苯乙烯-丁二烯-苯乙烯共聚物[D-KX405：CLAYTONE製造]20質量份於140℃下混合後，歷時15分鐘逐次少量添加液狀聚丁二烯[LBR-352：可樂麗製造]60質量份、1,9-壬二醇二丙烯酸酯20質量份、1,6-己二醇二甲基丙烯酸酯20質量份、2,2-二甲氧基苯基苯乙酮5質量份、界面活性劑[XL-100：第一工業製藥製造]3質量份、及2,6-二-第三丁基-對甲酚5質量份之混合物，添加結束後進而混練20分鐘，獲得感光性樹脂組合物。 使用該感光性樹脂組合物，以與實施例1相同之方式獲得柔版印刷用原版及印刷版。 將所獲得之感光性樹脂組合物、印刷原版及印刷版之評價結果示於表2。 又，將比較例1之感光性樹脂組合物之硬化物之剖面之SPM像示於圖3。於比較例1中，包含親水性共聚物(A)之相之面積率較大，包含親水性共聚物(A)之相大多數係面積為100 μm2 以上。 (比較例2) 如表1所示般變更彈性體(B)(苯乙烯-丁二烯-苯乙烯共聚物)與液狀聚丁二烯之添加量，除此以外，以與比較例1相同之方式獲得柔版印刷用原版及印刷版。 將所獲得之感光性樹脂組合物、印刷原版及印刷版之評價結果示於表2。於比較例2中，包含親水性共聚物(A)之相之面積率自身較小，又，包含親水性共聚物(A)之相大多數係面積未達3 μm2 。 (比較例3) 將製造例6中所獲得之親水性共聚物(A)之乾燥物100質量份、苯乙烯-丁二烯-苯乙烯共聚物[D-KX405：CLAYTONE製造]75質量份、液狀聚丁二烯[LBR-352：可樂麗製造]75質量份、1,9-壬二醇二丙烯酸酯20質量份、1,6-己二醇二甲基丙烯酸酯20質量份、2,2-二甲氧基苯基苯乙酮5質量份及界面活性劑[XL-100：第一工業製藥製造]3質量份、2,6-二-第三丁基-對甲酚5質量份之混合物同時添加至加壓捏合機中，混練30分鐘，獲得感光性樹脂組合物。 使用該感光性樹脂組合物，以與實施例1相同之方式獲得柔版印刷用原版及印刷版。 將所獲得之感光性樹脂組合物、印刷原版及印刷版之評價結果示於表2。 又，將比較例3之感光性樹脂組合物之硬化物之剖面之SPM像示於圖4。於比較例3中，包含親水性共聚物(A)之相大多數係面積為100 μm2 以上。 [表1] [表2] [產業上之可利用性] 本發明之柔版印刷用樹脂組合物可適宜地用作柔版印刷原版、尤其是水系顯影用柔版印刷原版之感光層之材料。 本申請案係基於2015年9月30日向日本專利廳提出申請之日本專利申請案(日本專利特願2015-194669)者，其內容係以參照之方式併入至本文中。In the following, the embodiments of the present invention (hereinafter referred to as "the present embodiment") will be described in detail, but the present invention is not limited thereto, and various modifications can be made without departing from the spirit and scope of the invention. In the present embodiment, the photosensitive resin composition for flexographic printing contains (A) a hydrophilic copolymer, (B) an elastomer, (C) a polymerizable unsaturated monomer, and (D) a photopolymerization initiator. It can be suitably used for the photosensitive resin composition layer of the flexographic printing plate of the water-based developing solution. In the present embodiment, the hydrophilic copolymer (A) is a polymer particle obtained by including a unit derived from a hydrophilic unsaturated monomer and internally crosslinking. The unit derived from the hydrophilic unsaturated monomer can be set, for example, to 0. 1 to 20% by mass, or 0. 5 to 15% by mass, and may be 1 to 10% by mass. Examples of such a polymer particle include polymer particles obtained by emulsion polymerization using a hydrophilic unsaturated monomer and, if necessary, another monomer copolymerizable therewith, as a dispersoid dispersed in water. The obtained water-dispersed latex was obtained by removing water. The hydrophilic unsaturated monomer is preferably a monomer containing at least one hydrophilic group and an unsaturated double bond, and examples thereof include a carboxylic acid, a sulfonic acid, a phosphoric acid or the like, or a salt or an acid anhydride thereof. A monomer having an unsaturated double bond, a monomer comprising a hydroxyl group and an unsaturated double bond, a monomer comprising acrylamide and an unsaturated double bond, a surfactant (monomer) containing a reactive unsaturated double bond, and the like. These compounds may be used alone or in combination of two or more kinds. The water-dispersible latex is not particularly limited, and examples thereof include acrylonitrile-butadiene copolymer latex, polychloroprene latex, polyisoprene latex, and polyurethane foam. Water-dispersed latex polymer such as acrylate-butadiene latex, vinyl pyridine polymer latex, butyl polymer latex, polysulfide rubber polymer latex, acrylate polymer latex, etc., and further, such water-dispersible latex It is also preferred to copolymerize one or more kinds of unsaturated functional groups containing an acidic functional group as follows: (meth) acrylate; or acrylic acid, methacrylic acid, crotonic acid, vinyl benzoic acid, cinnamic acid a monobasic acid such as a carboxylic acid or a sulfonic acid such as styrenesulfonic acid; or a dibasic acid such as itaconic acid, fumaric acid, maleic acid, citraconic acid or muconic acid. Further, the water-dispersed latex may further contain other polymerizations in addition to the polymer particles obtained by emulsion polymerization using a hydrophilic unsaturated monomer and, if necessary, another monomer copolymerizable therewith. The particles are as a dispersoid. Examples of such other polymers include polybutadiene, natural rubber, and styrene-butadiene copolymer. Among these, from the viewpoint of print durability, a water-dispersed latex containing a butadiene skeleton or an isoprene skeleton in a molecular chain is preferred. Specifically, polybutadiene latex, styrene-butadiene copolymer latex, acrylonitrile-butadiene copolymer latex, or/and such water-dispersible latex and (meth) acrylate or acrylic acid are preferred. , methacrylic acid, itaconic acid, etc. are copolymerized. Further, it is preferred that the styrene-butadiene copolymer is copolymerized with one or more kinds of (meth) acrylate or an acidic functional group-containing unsaturated monomer such as acrylic acid, methacrylic acid or itaconic acid. A water-dispersible latex of a copolymer. The amount of the unsaturated functional group-containing unsaturated monomer to be used is preferably from 1 to 30% by mass based on the total amount of the unsaturated monomer used for the synthesis of the hydrophilic copolymer (A). When the amount is 1% by mass or more, the water-based development tends to be easy. On the other hand, when the amount is 30% by mass or less, the moisture absorption amount of the photosensitive resin composition can be prevented from increasing, or the swelling amount of the ink can be increased. The processability at the time of mixing of the photosensitive resin composition deteriorates. Examples of the unsaturated monomer other than the acidic functional group-containing unsaturated monomer which can be used for the synthesis of the hydrophilic copolymer (A) include a conjugated diene, an aromatic vinyl compound, and a (meth) acrylate. Hydroxylethylene monocarboxylic acid alkyl ester monomer, unsaturated dibasic acid alkyl ester, maleic anhydride, vinyl cyanide compound, (meth) acrylamide and its derivatives, vinyl ester, ethylene Ethers, halogenated ethylenes, basic monomers having an amine group, vinyl pyridine, olefins, ruthenium-containing α,β-ethylenically unsaturated monomers, allyl compounds, and the like. More specifically, as the conjugated diene, 1,3-butadiene, isoprene, 2,3-dimethyl-1,3-butadiene, and 2-ethyl-1 can be exemplified. 3-butadiene, 2-methyl-1,3-butadiene, 1,3-pentadiene, chloroprene, 2-chloro-1,3-butadiene, cyclopentadiene, and the like. The aromatic vinyl compound may, for example, be styrene, α-methylstyrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, ethylstyrene, vinyltoluene or vinyl II. Toluene, bromostyrene, vinylbenzyl chloride, p-tert-butylstyrene, chlorostyrene, alkylstyrene, divinylbenzene, trivinylbenzene, and the like. Examples of the (meth) acrylate include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, n-butyl (meth)acrylate, and (meth)acrylic acid. Tributyl ester, isobutyl (meth)acrylate, n-amyl (meth)acrylate, isoamylhexyl (meth)acrylate, octyl (meth)acrylate, decyl (meth)acrylate, Ethyl methacrylate, dodecyl (meth)acrylate, octadecyl (meth)acrylate, cyclohexyl (meth)acrylate, phenyl (meth)acrylate, (methyl) Benzyl acrylate, 2-ethyl-hexyl (meth)acrylate, hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, hydroxycyclohexyl (meth)acrylate, (meth)acrylic acid Glycidyl ester, ethylene glycol di(meth)acrylate, ethylene glycol di(meth)acrylate, 1,3-butanediol di(meth)acrylate, 1,4-butanediol di Methyl) acrylate, propylene glycol di(meth) acrylate, 1,5-pentanediol di(meth) acrylate, neopentyl glycol di(meth) acrylate, 1,6-hexanediol (meth) acrylate, diethylene glycol di(meth) propylene Ester, triethylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, polypropylene glycol di(meth)acrylate, pentaerythritol III (Meth)acrylate, trimethylolpropane tri(meth)acrylate, tetramethylolmethanetetra(meth)acrylate, allyl (meth)acrylate, bis(4-propenyloxy) Polyethoxyphenyl)propane, methoxypolyethylene glycol (meth) acrylate, β-(meth) propylene oxiranyl ethyl hydrogen phthalate, β-(meth) propylene Ethoxyethyl hydrosuccinate, 3-chloro-2-hydroxypropyl (meth)acrylate, stearyl (meth)acrylate, phenoxyethyl (meth)acrylate, phenoxy polyethyl b Glycol (meth) acrylate, 2-hydroxy-1,3-bis(methyl) propylene decyloxypropane, 2,2-bis[4-((meth) propylene methoxy ethoxy) benzene Propane, 2,2-bis[4-((methyl)propenyloxy-diethoxy)phenyl]propane, 2,2-bis[4-((methyl)propenyloxy)- Polyethoxy)phenyl]propane, (meth)acrylic acid isoester, and the like. Examples of the vinyl-based monocarboxylic acid alkyl ester monomer having a hydroxyl group include 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, and 2-hydroxypropyl methacrylate. , 1-hydroxypropyl acrylate, 1-hydroxypropyl methacrylate, hydroxycyclohexyl (meth) acrylate, and the like. The unsaturated dibasic acid alkyl ester may, for example, be an alkyl crotonate, an alkyl orthoate, an alkyl fumarate or an alkyl maleate. Examples of the vinyl cyanide compound include acrylonitrile and methacrylonitrile. Examples of the (meth) acrylamide and the derivative thereof include (meth) acrylamide, N-hydroxymethyl (meth) acrylamide, N-alkoxy (meth) acrylamide, and the like. . Examples of the vinyl esters include vinyl acetate, vinyl butyrate, vinyl stearate, vinyl laurate, vinyl myristate, vinyl propionate, vinyl kocholate and the like. Examples of the vinyl ethers include methyl vinyl ether, ethyl vinyl ether, propyl vinyl ether, butyl vinyl ether, pentyl vinyl ether, and hexyl vinyl ether. Examples of the halogenated ethylenes include vinyl chloride, vinyl bromide, vinyl fluoride, vinylidene chloride, and vinylidene fluoride. The basic monomer having an amine group may, for example, be aminoethyl (meth)acrylate, dimethylaminoethyl (meth)acrylate or diethylaminoethyl (meth)acrylate. As the olefin, ethylene or the like can be exemplified. Examples of the α-, β-ethylenically unsaturated monomer containing ruthenium include vinyl trichloromethane, vinyl triethoxy decane, and the like. The allyl compound may, for example, be allyl ester or diallyl phthalate. In addition to this, a monomer having three or more double bonds such as triallyl isocyanurate may also be used. These monomers may be used singly or in combination of two or more. The mass of the conjugated diene and the other monomer is preferably from 5/95 to 95/5, more preferably from 50/50 to 90/10. When it exceeds this range, the rubber elasticity of the photosensitive resin composition for flexographic printing may be deteriorated. The hydrophilic copolymer (A) is preferably synthesized by emulsion polymerization. In this case, it is preferred to use a reactive emulsifier as an emulsifier (surfactant) used in the polymerization. The reactive emulsifier contains a radically polymerizable double bond, a hydrophilic functional group, and a hydrophobic group in a molecular structure, and has emulsification, dispersion, and wetting functions in the same manner as a general emulsifier, and is hydrophilic. When the copolymer (A) is subjected to emulsion polymerization, it is used alone in an amount of 0 parts by mass relative to 100 parts by mass of the unsaturated monomer other than the reactive emulsifier. In the case of 1 part by mass or more, a polymer-like emulsification (interface activity) agent having an average particle diameter of 5 to 500 nm is preferably synthesized. Examples of the structural examples of the radical polymerizable double bond in the molecular structure include a vinyl group, an acrylonitrile group, and a methacrylium group. Examples of the hydrophilic functional group in the molecular structure include an anionic group such as a sulfate group, a nitrate group, a phosphoric acid group, a boric acid group, and a carboxyl group; a cationic group such as an amine group; a polyoxyalkylene group and a polyoxymethylene group; a polyoxyalkylene chain structure such as a polyoxyalkylene group; or a hydroxyl group. Examples of the hydrophobic group in the molecular structure include an alkyl group and a phenyl group. The reactive emulsifier contains an anionic emulsifier, a nonionic emulsifier, a cationic emulsifier, an amphoteric emulsifier, etc. depending on the type of the hydrophilic functional group contained in the structure. Further, the radically polymerizable double bond, the hydrophilic functional group and the hydrophobic group in the molecular structure may each contain a plurality of kinds. As an ordinary surfactant in the present embodiment which can be used as a reactive emulsifier, the following examples are given: ADEKA REASOAP SE, AQUALON HS or BC or KH as an anionic surfactant. (First Industrial Pharmaceuticals), Latemul S (King), Antex MS (Japanese Emulsifier), ADEKA REASOAP SDX or PP (Asahi Chemical Industry), Hytenol A (First Industrial Pharmaceuticals), Eleminol RS (Sanyo Chemical Industry), SPINOMAR (Dongyang Soda Industrial Co., Ltd.), etc., as a nonionic surfactant, AQUALON RN, Noigen N (First Industrial Pharmaceuticals), ADEKA REASOAP NE (Asahi Chemical Industry Co., Ltd.), etc. are mentioned, but it is not limited to these. These may be used singly or in combination of two or more. In the present embodiment, the amount of the reactive emulsifier used is preferably in the range of 1 to 20 parts by mass based on 100 parts by mass of the hydrophilic copolymer (A) calculated based on the amount of the raw material added. When the amount of the reactive emulsifier is 1 part by mass or more, the image reproducibility of the obtained printing plate tends to be improved, and if it is 20 parts by mass or less, the printing durability of the obtained printing plate tends to be improved. . In the case of the present embodiment, when the hydrophilic copolymer (A) is synthesized by emulsion polymerization, a non-reactive emulsifier may be used as needed. Here, examples of the non-reactive emulsifier used as needed include anionic interfacial activity such as fatty acid soap, rosin acid soap, sulfonate, sulfate, phosphate, polyphosphate, and cresyl sarcosyl ester. a cationic surfactant such as a nitrile oil derivative, a fat or oil derivative, a fatty acid derivative or an α-olefin derivative; an alcohol ethoxylate, an alkylphenol ethoxylate, a propoxylate, an aliphatic alkanol A nonionic surfactant such as a guanamine, an alkyl polyglycoside, a polyoxyethylene sorbitan fatty acid ester, or an oxyethylene oxypropylene block copolymer. These may be used singly or in combination of two or more. Examples of the sulfonate include an alkyl sulfonate, an alkyl sulfate, an alkyl sulfosuccinate, a polyoxyethylene alkyl sulfate, a sulfonated fat, an alkyl diphenyl ether disulfonate, and α. An olefin sulfonate, an alkyl glyceryl ether sulfonate, an N-mercaptomethyl taurate or the like. Other examples of such surfactants include those described in the "Interactivator Handbook (Takabashi, Namba, Koike, Kobayashi: Engineering Books, 1972)". The non-reactive emulsifier is preferably used in an amount of less than 1 part by mass based on 100 parts by mass of the hydrophilic copolymer (A) calculated based on the amount of the raw material added. In the case of less than 1 part by mass, the obtained printing plate can exhibit an appropriate water swelling ratio, preventing a decrease in abrasion resistance upon adhesion of the ink and a decrease in image reproducibility after moisture absorption. As the emulsion polymerization method of the hydrophilic copolymer (A), a specific amount of water, an emulsifier, and other additives are usually added in advance to a reaction system adjusted to a temperature at which polymerization can be carried out, and in the system, by fractional operation Or a continuous operation, a polymerization initiator, an unsaturated monomer, an emulsifier, a regulator, etc. are added to the reaction system. Further, it is also a method which is usually used frequently in advance to add a specific amount of a latex, an initiator, an unsaturated monomer, and other modifiers to the reaction system as needed. Further, by attempting to add an unsaturated monomer, an emulsifier, other additives, and a modifier to the reaction system, the layer structure of the synthesized hydrophilic copolymer particles can be changed stepwise. In this case, the physical properties of the structure representing each layer include hydrophilicity, glass transition point, molecular weight, crosslinking density, and the like. Further, the number of stages of the layer structure is not particularly limited. In the present embodiment, a known chain transfer agent can be used for the polymerization of the hydrophilic copolymer (A). For example, examples of the chain transfer agent containing a sulfur element include an alkanethiol such as a tert-dodecyl mercaptan or n-dodecyl mercaptan; a thioalkanol such as mercaptoethanol or mercaptopropanol; a thioalkyl carboxylic acid such as thioglycolic acid or thiopropionic acid; an alkyl thiocarboxylate such as octyl thioglycolate or octyl thiopropionate; sulfur such as dimethyl sulfide or diethyl sulfide; ether. Further, examples of the chain transfer agent include halogenated hydrocarbons such as terpinene, dipentene, triterpene, and carbon tetrachloride. Among these, the alkanethiol is preferable because the chain transfer rate is large and the physical properties of the obtained polymer are good. These chain transfer agents may be used singly or in combination of two or more. The chain transfer agents are mixed into the monomer to be supplied to the reaction system, or a specific amount is separately added at a specific time. The amount of the chain transfer agent is preferably 0. The total amount of the chain transfer agent used is 0. 1 to 10% by mass. When it is less than this range, the workability at the time of mixing of the photosensitive resin composition may be deteriorated, and if it is more than this range, the molecular weight may be remarkably lowered. In the present embodiment, a polymerization inhibitor may be used as needed in the polymerization of the hydrophilic copolymer (A). The polymerization inhibitor is a compound which reduces the radical polymerization rate by being added to an emulsion polymerization system. More specifically, it is a polymerization rate retarder, a polymerization inhibiting agent, a chain transfer agent having a low radical reactivation reactivity, and a monomer having a low radical reactivation reactivity. The polymerization inhibitor is usually used to adjust the polymerization rate and adjust the latex properties. The polymerization inhibitors are added to the reaction system by a fractional operation or a continuous operation. In the case where a polymerization inhibitor is used, the strength of the latex film is improved, and the printing durability is improved. Although the details of the reaction mechanism are not clear, it is considered that the polymerization inhibitor is closely related to the three-dimensional structure of the polymer, and thus it is presumed that there is an effect in adjusting the physical properties of the latex film. Examples of the polymerization inhibitor include hydrazines such as o-, m- or p-benzoquinone; nitrobenzenes, nitro compounds such as o-, m- or p-dinitrobenzene; and diphenylamine-like amines. a butyl catechol-like catechol derivative; 1,1-diphenylethylene or α-methylstyrene, 2,4-diphenyl-4-methyl-1-pentyl a 1,1-disubstituted vinyl compound such as an alkene; a 1,2-disubstituted vinyl compound such as 2,4-diphenyl-4-methyl-2-pentene or cyclohexene; and the like. In addition, it can also be listed as: "POLYMER HANDBOOK 3rd Ed. (J. Brandup, E. H. Immergut: John Wiley & Sons, 1989)", "Revision of the Chemistry of Polymer Synthesis (Otsu: Chemistry, 1979. The compound described as a polymerization inhibitor or a polymerization inhibitor. Among these, 2,4-diphenyl-4-methyl-1-pentene (α-methylstyrene dimer) is particularly preferable in terms of reactivity. These polymerization inhibitors may be used singly or in combination of two or more. The amount of the polymerization inhibitor to be used is preferably 10% by mass or less based on the total amount of the unsaturated monomers used in the polymerization of the hydrophilic copolymer (A). If it is more than this, there is a case where the polymerization rate is remarkably lowered. The radical polymerization initiator is one which undergoes radical decomposition in the presence of a heat or a reducing substance to initiate addition polymerization of a monomer, and both an inorganic initiator and an organic initiator can be used. Examples of such a radical polymerization initiator include water-soluble or oil-soluble peroxodisulfates, peroxides, azobis compounds, and the like. Specifically, potassium peroxydisulfate and peroxydicarbonate are used. Sodium sulfate, ammonium peroxodisulfate, hydrogen peroxide, tert-butyl hydroperoxide, benzammonium peroxide, 2,2-azobisbutyronitrile, cumene hydroperoxide, etc. POLYMER HANDBOOK (3rd edition), J. Brandrup and E. H. Immergut, a compound described in John Willy & Sons (1989). Further, a so-called redox polymerization method in which a reducing agent such as acidic sodium sulfite, ascorbic acid or a salt thereof, erythorbic acid or a salt thereof, or a white powder is used in combination with a polymerization initiator may be used. Among these, peroxodisulfate is particularly suitable as a polymerization initiator. The amount of the polymerization initiator used is based on the mass of all unsaturated monomers, usually from 0. 1 to 5. 0质量%的范围内, preferably from 0. 2~3. Choose within the range of 0% by mass. When it is less than this range, the stability of the synthesis of the hydrophilic copolymer may not be obtained, and if it is more than this range, the moisture absorption amount of the photosensitive resin composition may increase. In the present embodiment, various polymerization regulators may be added as needed in the synthesis of the hydrophilic copolymer (A). For example, as the pH adjuster, a pH adjuster such as sodium hydroxide, potassium hydroxide, ammonium hydroxide, sodium hydrogencarbonate, sodium carbonate or disodium hydrogen phosphate may be added. Further, various chelating agents such as sodium edetate may be added as a polymerization regulator. Further, as other additives, a viscosity reducing agent such as alkali-inductive latex or hexametaphosphoric acid, a water-soluble polymer such as polyvinyl alcohol or carboxymethyl cellulose, a tackifier, various anti-aging agents, and ultraviolet absorbers may be added. Various additives such as a preservative, a sterilizing agent, a defoaming agent, a dispersing agent such as sodium polyacrylate, a water-resistant agent, a metal oxide such as zinc white, an isocyanate compound, a crosslinking agent such as an epoxy compound, a lubricant, and a water retaining agent. The method of adding the additives is not particularly limited, and may be added during the synthesis of the hydrophilic copolymer or after the synthesis. In the present embodiment, the polymerization temperature in the case where the hydrophilic copolymer (A) is emulsion-polymerized is usually selected in the range of 60 to 120 ° C, but it may be lower by the above redox polymerization method or the like. The polymerization is carried out at a temperature. Further, as the redox catalyst, a metal catalyst such as a divalent iron ion, a ferric ion, a copper ion or the like may be allowed to coexist. The hydrophilic copolymer (A) is preferably in the form of particles, and its average particle diameter is preferably 500 nm or less, and particularly preferably 100 nm or less. If the average particle diameter is too large, the water-based developability of the obtained printing original plate may be lowered. Further, the toluene gel fraction of the hydrophilic copolymer (A) is preferably from 60 to 99%. When the gel fraction is less than the above range, the strength of the obtained printing plate is lowered, and if it exceeds this range, the mixing property of the hydrophilic copolymer (A) and the elastomer (B) tends to be remarkably lowered. Here, the toluene gel fraction means that a dispersion of about 30% by mass of the hydrophilic copolymer (A) is dropped onto a Teflon sheet in an appropriate amount, and dried at 130 ° C for 30 minutes to obtain a hydrophilic copolymer. (A) 0. 5 g, immersed in 30 ml of toluene at 25 ° C, shaken for 3 hours using a shaker, filtered through a 320 SUS sieve, and the mass after the unpassed portion was dried at 130 ° C for 1 hour was divided by 0. The mass fraction (%) obtained by 5(g). In the present embodiment, the (B) elastomer is an elastomer exhibiting rubber elasticity at normal temperature (25 ° C), and examples thereof include a thermoplastic block copolymer, a polybutadiene, and a polyacrylonitrile-butadiene. An alkene, a polyurethane elastomer or the like. Among them, preferred are thermoplastic block copolymers. The thermoplastic block copolymer is preferably obtained by polymerizing a monovinyl-substituted aromatic hydrocarbon monomer and a conjugated diene monomer, and examples of the monovinyl-substituted aromatic hydrocarbon monomer include styrene. Further, as the conjugated diene monomer, butadiene, isoprene or the like can be used as the α-methylstyrene, p-methylstyrene or p-methoxystyrene. Specific examples thereof include a styrene-butadiene-styrene block copolymer or a styrene-isoprene-styrene copolymer. Here, in the styrene-butadiene-styrene block copolymer or the styrene-isoprene-styrene copolymer, a styrene-butadiene copolymer or a styrene-isoprene may also be mixed. a diblock such as an ene copolymer. Further, it may be a butadiene portion of styrene and butadiene or isoprene in a styrene-butadiene-styrene block copolymer or a styrene-isoprene-styrene copolymer. Or random copolymerization on the isoprene portion. Here, as for the content of the monovinyl-substituted aromatic hydrocarbon unit in the elastomer (B), when a certain amount is contained, the cold flow of the photosensitive resin composition is suppressed to obtain good thickness precision, and When the amount is less than a certain amount, the hardness of the flexographic printing plate is suppressed to obtain good printing quality, and it is preferably in the range of 8 to 50% by mass. The vinyl bonding unit in the conjugated diene segment of the elastomer (B) contributes to the improvement of the reproducibility of the relief, but also causes an increase in the adhesion of the surface of the flexographic printing plate. From the viewpoint of achieving the balance between the two characteristics, the average ratio of the vinyl bonding unit is preferably from 5 to 40 mol%, and more preferably from 10 to 35 mol%. Furthermore, the average ratio of the monovinyl-substituted aromatic hydrocarbon unit and the conjugated diene unit, or the average ratio of the vinyl-bonded unit in the conjugated diene segment of the elastomer (B) can be determined by IR (Infrared Radiation) , infrared radiation) spectrum or NMR (Nuclear Magnetic Resonance). The amount of the elastomer (B) is preferably 30 parts by mass or more and less than 250 parts by mass based on 100 parts by mass of the hydrophilic copolymer (A). More preferably, it is 30 mass parts or more and less than 200 mass parts. Further, it is preferably 50 parts by mass or more and less than 170 parts by mass. When the amount is less than 30 parts by mass, the print durability is lowered, and the swelling ratio of the ink having a polarity tends to increase. When the amount is 250 parts by mass or more, the developability in the aqueous developing solution tends to decrease. Examples of the (C) polymerizable unsaturated monomer used in the present embodiment include carboxylic acid esters such as acrylic acid, methacrylic acid, fumaric acid, and maleic acid, and acrylamide or methyl amide. A derivative of a acrylamide, an allyl ester, styrene and a derivative thereof, an N-substituted maleimide compound. Specific examples thereof include diacrylates and dimethacrylates of alkanediols such as hexanediol and decanediol, or ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, and polyethylene glycol. , butanediol diacrylate and dimethacrylate, or trimethylolpropane triacrylate and trimethacrylate, pentaerythritol tetraacrylate and tetramethacrylate, or N, N'-six Methylene bis acrylamide and methacrylamide, styrene, vinyl toluene, divinyl benzene, dipropylene phthalate, triallyl cyanurate, diethyl bismuth Ester, dibutyl fumarate, dioctyl fumarate, distearyl fumarate, butyl octyl methacrylate, diphenyl fumarate, anti Dibenzyl phthalate, dibutyl maleate, dioctyl maleate, bis(3-phenylpropyl) fumarate, dilauryl fumarate , dibehenyl fumarate, N-lauryl maleimide, and the like. These may be used singly or in combination of two or more. The content of the polymerizable unsaturated monomer (C) is preferably 10 parts by mass or more and less than 200 parts by mass based on 100 parts by mass of the hydrophilic copolymer (A). It is more preferably 20 parts by mass or more and less than 150 parts by mass, more preferably 30 parts by mass or more and less than 100 parts by mass. When the amount is 10 parts by mass or more, the formation of fine dots or characters is improved, which is preferable. In addition, when it is 200 parts by mass or less, the effect of suppressing the storage and transportation of the uncured plate is suppressed, and the hardness of the obtained plate becomes moderate, and the printed matter of the printed matter having poor surface quality is unevenly printed. It is preferable that the ink adsorption property of the solid portion is good or the like. Examples of the (D) photopolymerization initiator used in the present embodiment include benzophenone, mazinone, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, and benzoin isoindene. Ether, α-hydroxymethylbenzoin, α-hydroxymethylbenzoin methyl ether, α-methoxybenzoin methyl ether, benzoin phenyl ether, α-t-butyl benzoin, 2,2-dimethoxyphenylbenzene Ethyl ketone, 2,2-diethoxyphenyl acetophenone, diphenylethylenedione, neopentyl ketone, hydrazine, benzopyrene, 2-ethyl hydrazine, 2-chloropurine, etc. . These may be used singly or in combination of two or more. The content of the (D) photopolymerization initiator is preferably 0% by mass based on 100 parts by mass of the hydrophilic copolymer (A). 1 part by mass or more and less than 50 parts by mass. More preferably, it is 1 part by mass or more and less than 30 parts by mass. At 0. In the case of 1 part by mass or more, the formation of fine dots or characters is improved, which is preferable. In addition, in the case of 50 parts by mass or less, the active light transmittance of the photosensitive resin composition such as ultraviolet rays can be ensured, and the exposure sensitivity can be maintained, which is preferable. In the present embodiment, the photosensitive resin composition may further contain at least one compound (E) selected from the group consisting of a surfactant and a (meth) acrylate monomer having a polyalkylene glycol chain. . Examples of the surfactant of the compound (E) which can be used in the present embodiment include an anionic surfactant, an ionic surfactant, a nonionic surfactant, an anionic reactive surfactant, and a nonionic Sexually reactive surfactants, etc. Specific examples thereof include polyoxyethylene styrenated sodium phenyl ether sulfate, polyoxyalkylene alkyl branched decyl ether sulfate, polyoxyethylene isodecyl ether ammonium sulfate, polyoxyethylene tridecyl ether sulfate, Polyoxyethylene lauryl ether sulfate, polyoxyethylene lauryl ether ammonium sulfate, polyoxyethylene alkyl ether sulfate, polyoxyethylene oil based cetyl ammonium sulfate, polyoxyethylene oil based cetyl sulfate sodium sulfate, polyoxyethylene Tridecyl ether phosphate, polyoxyethylene alkyl (C2 - C16) ether phosphate, polyoxyethylene alkyl (C2 - C16) ether phosphate - monoethanolamine salt, alkyl (C2-C16) sodium phosphate , alkyl (C2-C16) phosphate-monoethanolamine salt, disodium lauryl sulfosuccinate, polyoxyethylene sulfosuccinate disodium lauryl disodium, polyoxyethylene alkyl (C2-C20) sulfosuccinic acid Disodium, linear alkylbenzene sulfonate, linear alkyl benzene sulfonic acid, sodium α-olefin sulfonate, phenol sulfonic acid, sodium dioctyl sulfosuccinate, sodium lauryl sulfate, potassium salt of higher fatty acid, etc. Anionic surfactant; alkyl chloride (C8-C20) trimethylammonium chloride, alkyl chloride (C8-C20) dimethylethylammonium chloride, dimercaptodimethylammonium chloride, chlorine Lauryl dimethyl benzyl ammonium, stearyl dimethyl hydroxyethyl ammonium p-toluene sulfonate, stearyl dimethyl amino propyl decylamine, tributyl benzyl ammonium chloride, lauryl Methylaminoacetic acid betaine, lauryl propyl betaine, coconut fatty amidoxime propyl betaine, octylamine propyl betaine, lauryl dimethyl amine oxide ionic surfactant; polyoxygen extension Alkyl tridecyl ether, polyoxyethylene isodecyl ether, polyoxyalkylene lauryl ether, polyoxyalkylene alkyl ether, a mixture of polyoxyalkylene ether and polyether polyol, polyether polyol , polyoxyethylene sulfonated phenyl ether, polyoxyethylene naphthalene ether, phenoxyethanol, polyoxyethylene phenyl ether, polyoxyethylene polyoxypropylene glycol, polyoxyethylene lauryl ether, polyoxyethylene oil based cetyl ether, polyoxygen Ethylene oleate, polyoxyethylene distearate, polyoxyethylene glyceryl isostearate, polyoxyethylene hydrogenated castor oil, coconut fatty acid diethanolamine, polyoxyethylene alkylamine, sorbitol three Oleate, sorbitan sesquioleate, sorbitan monooleate, sorbitan monococoate, sorbitan Phthalate, polyoxyethylene sorbitan monocoamate, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan monooleate, octyl polyglycoside, butyl polyglycoside, sucrose Nonionic surfactants such as benzoate, sucrose acetate, sucrose fatty acid ester; polyoxyethylene-1-(allyloxymethyl)alkyl ether ammonium sulfate, polyoxyethylene nonyl propylene group An anionic reactive surfactant such as ammonium phenyl ether sulfate; a nonionic reactive surfactant such as polyoxyethylene nonyl phenyl phenyl ether. Further, as the (meth) acrylate monomer having a polyalkylene glycol chain as the compound (E) which can be used in the present embodiment, examples of the monomer having a polyalkylene glycol include a polyethylene glycol mono(acrylate) or polyethylene glycol di(meth)acrylate containing an ethylene glycol chain in a range of 2 or more and 20 or less, and a polyethylene glycol chain containing polyethylene glycol in a range of 2 or more and 20 or less Alcohol mono(meth)acrylate, polypropylene glycol di(meth)acrylate, polyethylene glycol polypropylene glycol di(meth) containing polyethylene glycol chain and/or polypropylene glycol chain in the range of 2 to 20, respectively Acrylate, tolyl polyethylene glycol (meth) acrylate, nonyl phenoxy polyethylene glycol (meth) acrylate, and the like. The surfactant of the compound (E) or the (meth) acrylate monomer having a polyalkylene glycol chain may be used singly or in combination of two or more. Among the above-mentioned compounds (E), a nonionic surfactant, a nonionic reactive surfactant, and a (meth) acrylate monomer having a polyalkylene glycol chain are preferable. The content of the compound (E) is preferably 0.% by mass based on 100 parts by mass of the hydrophilic copolymer (A). 1 part by mass or more and less than 15 parts by mass. More preferably 0. 5 parts by mass or more and less than 10 parts by mass. Not up to 0. In the case of 1 part by mass, the developability in the aqueous developing solution tends to decrease, and in the case of 15 parts by mass or more, the haze of the obtained resin composition becomes high, or the drying time after development is prolonged. Or the tendency to reduce the solvent resistance of aqueous inks. In the present embodiment, the photosensitive resin composition may further contain a plasticizer component (F). Examples of the plasticizer component (F) include hydrocarbon oils such as naphthenic oils and alkane oils, liquid polybutadiene, liquid polyisoprene, and terminal modified products of liquid polybutadiene. Acrylonitrile-butadiene copolymer, carboxylic acid modified product of liquid acrylonitrile-butadiene copolymer, liquid styrene-butadiene copolymer, polystyrene having a number average molecular weight of 2,000 or less, and bismuth An acid ester, a phthalate ester, a carboxylic acid-modified acrylic polymer, or the like. Among them, a liquid polybutadiene, a terminal modification of a liquid polybutadiene modified by an OH group or a carboxyl group, a liquid acrylonitrile-butadiene copolymer, and a liquid propylene are preferable. A carboxylic acid modified product of a nitrile-butadiene copolymer, a liquid styrene-butadiene copolymer, or a carboxylic acid-modified acrylic polymer. If liquid polybutadiene, liquid polybutadiene terminal modification, liquid acrylonitrile-butadiene copolymer, liquid acrylonitrile-butadiene copolymer carboxylic acid modification, liquid The styrene-butadiene copolymer and the carboxylic acid-modified acrylic polymer are used as the plasticizer component (F) to improve knead moldability and developability, and the plasticizer component (F) is easily mixed into the elastomer ( In B), the print durability is improved, which is preferable. The amount of the plasticizer component (F) relative to 100 parts by mass of the hydrophilic copolymer (A) is preferably 1 part by mass or more and less than 250 parts by mass, more preferably 10 parts by mass or more and less than 220 parts by mass. Further, it is preferably 20 mass or more and less than 200 parts by mass. When the amount is less than 1 part by mass, the hardening shrinkage after molding tends to increase, and in the case of 250 parts by mass or more, the cold flow property tends to be deteriorated. In addition, in the photosensitive resin composition for flexographic printing of the present embodiment, in addition to the above-mentioned necessary or optional components, various auxiliary additive components such as a thermal polymerization inhibitor or an ultraviolet absorber may be added as needed. , anti-fog stabilizer, light stabilizer, etc. In the present embodiment, the photosensitive resin composition for flexographic printing preferably has a structure in which a phase containing a hydrophilic copolymer (A) is separated from another phase, and specifically, at least a part thereof has the following structure, that is, includes The phase of the hydrophilic copolymer (A) is an island and the other phases are sea-like so-called island structures. In the present embodiment, when the cross section of the cured product of the photosensitive resin composition for flexographic printing is observed, the phase of the cured copolymer (A) is contained in the cross section of the cured product of the resin composition. Ratio (area ratio) S A 15% or more and less than 60%, and among the phases containing the above hydrophilic copolymer (A), the phase area is 3 μm 2 Above and less than 100 μm 2 The ratio of the person is 20 (area%) or more. In particular, when the cross section of the 30 μm square of the cured product of the photosensitive resin composition is observed, it is preferable that the ratio of the phase containing the hydrophilic copolymer (A) in the 30 μm square cross section is S. A 15% or more and less than 60%, in the phase containing the above hydrophilic copolymer (A), the phase area is 3 μm 2 Above and less than 100 μm 2 The ratio of the person is 20 (area%) or more. The state of dispersion of the phase containing the hydrophilic copolymer (A) in the photosensitive resin composition can be confirmed by cutting a film of a cured product of the photosensitive resin composition and observing it. Further, the phase area of the phase containing the hydrophilic copolymer (A) in the photosensitive resin composition is 3 μm. 2 Above and less than 100 μm 2 The ratio of the uncured material and the hardened material is not changed, and the cross section of the uncured material can be observed in the same manner as the cross section of the hardened material, but the uncured material is oozing out due to the presence of the uncured material. In this case, it is preferable to observe the profile of the hardened material. The observation method is not limited, and for example, it can be observed by a transmission microscope (TEM), scanning microscopy (SEM) observation by thin film sectioning using yttrium oxide or tungsten tungsten, or scanning by atomic force microscopy (AFM). Observation was carried out by observation of a phase pattern of a needle microscope (SPM) or the like. In addition, measurement by a phase pattern of a scanning probe microscope (SPM) of an atomic force microscope (AFM) does not require dyeing of a sample, and the measurement can be easily performed only by cutting a film slice from the resin composition, and It is preferred that the phase containing the hydrophilic copolymer (A) can be easily separated from the other phases by the relative comparison of the hardness of the respective phases. The SPM measurement can be carried out in both the resin composition before curing and the resin composition after hardening, but there is a reversal of the relative hardness of each phase due to polymerization of the polymerizable unsaturated monomer (C) in the hardening process. situation. In the resin composition of the present embodiment, the phase containing the hydrophilic copolymer (A) is softer than the other phases in the resin composition before curing, and is reversed to a phase harder than the other phases in the resin composition after curing. Specifically, the ratio (area ratio) of the phase containing the hydrophilic copolymer (A) S A Or the phase area in the phase containing the hydrophilic copolymer (A) is 3 μm 2 Above and less than 100 μm 2 The ratio of the person can be obtained as follows. An image of 30 μm square (30 μm square) was obtained by the above observation using the SPM phase mode of the atomic force microscope. According to the obtained image, the image processing (binarization) is performed based on the phase difference indicating the relative hardness information, and the phase containing the hydrophilic copolymer (A) and the other phase (the phase containing the elastomer (B)) are included. Separating, determining the area of each phase containing the hydrophilic copolymer (A), and determining the phase containing the hydrophilic copolymer (A) based on the total (the total area of the phase including the hydrophilic copolymer (A)) Ratio of the cross section of the cured product of the resin composition S A (area%). (Specifically, the above total area is determined relative to the observation area (900 μm) 2 Area ratio) Further, a histogram is prepared based on the area of each phase containing the hydrophilic copolymer (A) (for example, 0 μm) 2 1 μm as the starting value 2 Histogram of the scale). According to the histogram, the phase area can be found to be 3 μm. 2 Above and 100 μm 2 The ratio of the area of the phase containing the hydrophilic copolymer (A) to the total area of the phase containing the hydrophilic copolymer (A) (%). In the cross section of the cured product or the uncured material of the photosensitive resin composition for flexographic printing, the ratio of the phase of the hydrophilic copolymer (A) (area ratio) is S. A It is 15% or more and less than 60%, more preferably 25% or more and 55% or less, further preferably 25% or more and 50% or less. Ratio S of the phase containing the hydrophilic copolymer (A) A When it is less than 15%, the development speed in the aqueous developing solution tends to be slow, and in the case of 60% or more, the printing durability tends to be lowered. In the present embodiment, the phase area of the phase containing the hydrophilic copolymer (A) obtained by the measurement and image processing by the above method is 3 μm. 2 Above and less than 100 μm 2 The ratio is 20 (area%) or more, preferably 30 (area%) or more, more preferably 40 (area%) or more, and still more preferably 50 (area%) or more. According to the study by the inventors of the present invention, it was found that the phase area was 3 μm among the phases containing the hydrophilic copolymer (A). 2 Above and less than 100 μm 2 The ratio of the phase is within the above range, and the hydrophilic copolymer (A) and the elastomer (B) are sufficiently mixed, whereby the printing durability or the plate property can be maintained at a high level. Developability in aqueous developer. It can be considered that if the phase area is 3 μm 2 Above and less than 100 μm 2 When the ratio of the phase is high, the developability in the aqueous developing solution is increased because if the phase containing the hydrophilic copolymer (A) is small, the hydrophilicity of the starting point of development can be obtained. The interface between the phase of the copolymer (A) and the other phases increases. However, even if the phase containing the hydrophilic copolymer (A) is too small, the developability is lowered. The reason for this is not clear, but it is considered that if the phase containing the hydrophilic copolymer (A) is too small, it is a part of the starting point of the brush or the like when it is removed by a mechanical member such as a brush in the aqueous developing solution. Smaller, the developability is lowered. On the other hand, when the phase containing the hydrophilic copolymer (A) is too large, it is easy to remove by a brush or the like, but when it is made into a printing plate, the hydrophilic copolymer is inferior in abrasion resistance. The phase of (A) is increased, thereby easily causing wear or loss of the printing plate, and as a result, print durability is lowered. However, the mechanism of the effects of the present invention is not limited to the above assumptions. In the present embodiment, the ratio of the phase containing the hydrophilic polymer (A) in the cross section of the cured product of the resin composition is preferably S. A (area%), mass ratio to the hydrophilic copolymer (A) in the above resin composition W A (% by mass) ratio S A /W A It is 1.35 or more. The mass ratio of the hydrophilic copolymer (A) in the resin composition W A The ratio (% by mass) of the mass of the hydrophilic copolymer (A) to the mass of the resin composition is shown. S A /W A It is preferably 1.35 or more, more preferably 1.40 or more, still more preferably 1.50 or more. On S A /W A When it is 1.35 or more, the developability in an aqueous developing solution can be improved. In the present embodiment, the polymerizable unsaturated monomer (C) is preferably contained in the phase containing the hydrophilic copolymer (A) in the photosensitive resin composition for flexographic printing. Since the hydrophilic copolymer (A) is a polymer particle, if the polymerizable unsaturated monomer (C) is contained in the phase containing the hydrophilic copolymer (A), the polymerizable unsaturated monomer (C) will The polymer particles of the hydrophilic copolymer (A) are connected to each other, whereby the printing durability of the plate after the plate making can be improved. Further, the case where the polymerizable unsaturated monomer (C) is contained in the phase containing the hydrophilic copolymer (A) is confirmed by the fact that in the measurement by the phase mode of SPM, when it is not cured, it is contained. The phase of the hydrophilic copolymer (A) is softer than the phase containing the elastomer (B), and after photohardening, the phase containing the hydrophilic copolymer (A) is more rigid than the phase containing the elastomer (B) It was observed in the form. In the present embodiment, the method for producing the photosensitive resin composition for flexographic printing is not limited. In the case where the hydrophilic copolymer (A) is obtained in the form of an aqueous dispersion (latex), it is preferred to use water by various methods and then use it. For example, after the hydrophilic copolymer (A) is solidified by using a coagulant such as a sulfate, a nitrate, a hydrochloride, a carbonate or a carboxylate, the hydrophilic copolymer (A) is self-hydrolyzed by a dehydration step such as centrifugation. The water dispersion is removed to a certain extent, and then mixed with the plasticizer component (F), the surfactant (E), a stabilizer, etc., and then dried, and may be mixed with the plasticizer component as needed. (F), a compound (E) such as a surfactant, a stabilizer, and the like are mixed, and then water is removed from the aqueous dispersion containing the hydrophilic copolymer (A) by distillation or the like. When the aqueous dispersion containing the hydrophilic copolymer (A) is mixed with a compound such as a plasticizer component (F) or a surfactant (E) and a stabilizer, and then water is removed by distillation or the like, The compound (E) such as the plasticizer component (F) and the surfactant, and the stabilizer are uniformly dispersed in the hydrophilic copolymer (A), and the image is not formed when the image is formed in the printing plate. Therefore, it is better. As a method of removing water by distillation or the like, a batch dryer such as a kneader, a conical spiral mixer, or a ribbon mixer may be used, or a devolatilizing extruder, a thin film distillation machine, a CD dryer, or a KRC may be used. Continuous dryers such as kneaders and SC processors. In the above manner, at least one of the hydrophilic copolymer (A), the hydrophilic copolymer (A), the plasticizer component (F) to be added, the compound (E) such as a surfactant, and the stabilizer are obtained. After drying the above mixture, the elastomer (B), the polymerizable unsaturated monomer (C) or the photopolymerization initiator (D) are used together with various extruders, Bamburi mixers, kneaders, and the like. The kneading device is kneaded, whereby a photosensitive resin composition can be prepared. In the present embodiment, the phase area in the phase containing the hydrophilic copolymer (A) is 3 μm in the cross section of the cured product or the uncured material of the photosensitive resin composition for flexographic printing. 2 Above and less than 100 μm 2 The ratio of the phase is set to 20 (area%) or more. For example, it is preferable to control the screw pattern or the screw rotation speed when the resin composition is kneaded, in the case of using the extruder, in the case of using the batch type kneader. When the rotation speed or the kneading time is controlled, the kneading state is adjusted, or the compound (E) or the plasticizer component (F) is previously added to the hydrophilic copolymer (A), and then mixed with other components, or further, an aqueous dispersion. In the case where the hydrophilic copolymer (A) is supplied, the amount of moisture remaining in the hydrophilic copolymer (A) is controlled, whereby the dispersed state of the phase containing the hydrophilic copolymer (A) is controlled. In the present embodiment, it is particularly preferred to obtain a photosensitive resin composition for flexographic printing by sequentially including the steps 1 to 3 described below. 1. In the aqueous dispersion containing the hydrophilic copolymer (A), at least one selected from the group consisting of a surfactant and a (meth) acrylate monomer having a polyalkylene glycol chain is added. a step of the compound (E) and/or the plasticizer component (F); 2. a step of removing water from the aqueous dispersion containing the hydrophilic copolymer (A); and 3. a component obtained in the step 2 In the mixture of the hydrophilic copolymer (A), an elastomer (B), a polymerizable unsaturated monomer (C), and a photopolymerization initiator (D) are added, and a step of kneading is carried out. In the present embodiment, the flexographic printing original plate contains at least the photosensitive resin composition of the present embodiment or a photosensitive layer containing the photosensitive resin composition. The photosensitive layer can be formed, for example, by forming a photosensitive resin composition into a layer having a desired thickness by hot press molding, calendering treatment, extrusion molding, or the like. In order to maintain the accuracy of the printing plate, the flexographic printing original plate can also be formed as a laminate having a photosensitive layer on a support such as polyester. Further, an infrared ablation layer for directly drawing the photosensitive layer or a contact with the negative film may be provided on the surface of the photosensitive layer opposite to the support, or may be used for enabling A flexible film layer (also referred to as a transparent image carrier layer or an anti-adhesion layer) that can be subjected to water development for reuse of a negative film. The support or the infrared ablation layer and the flexible film layer can be adhered to the photosensitive layer by roll lamination, for example, after the photosensitive layer is formed into a sheet shape. After lamination, heat pressing can be further performed to improve the surface precision of the photosensitive layer. In the present embodiment, examples of the active light source for photohardening (forming a latent image formation) of the photosensitive layer of the flexographic printing original plate include a low pressure mercury lamp, a high pressure mercury lamp, an ultraviolet fluorescent lamp, and a carbon arc lamp. Xenon lamps, zirconium lamps, sunlight, etc. In the present embodiment, after the latent image is formed by light-irradiating the photosensitive layer by the infrared ray ablation layer or the transparent image carrier after the drawing, the unexposed portion is removed (developed) using a water-based developing solution, whereby embossing can be obtained ( printed version). The water-based developer is a developer containing water as a main component, and may be water itself, or may be, for example, a nonionic or anionic surfactant or a pH adjuster or a cleaning accelerator as needed in water. Waiting for the winner. Specific examples of the nonionic surfactant include polyoxyalkylene alkyl or alkenyl ether, polyoxyalkylene alkyl or alkenylphenyl ether, polyoxyalkylene alkyl or alkenylamine. , polyoxyalkylene alkyl or alkenyl decylamine, ethylene oxide / propylene oxide block adduct, and the like. Specific examples of the anionic surfactant include a linear alkylbenzenesulfonate having an alkyl group having an average carbon number of 8 to 16, an α-olefinsulfonate having an average carbon number of 10 to 20, an alkyl group or The alkenyl group has a carbon number of 4 to 10 dialkyl sulfosuccinate, a sulfonate of a fatty acid lower alkyl ester, an alkyl sulfate having an average carbon number of 10 to 20, and an average carbon number of 10 to 20 An alkyl or alkenyl group of a chain or a branched chain is added with an alkyl ether sulfate having an average of 0.5 to 8 moles of ethylene oxide, a saturated or unsaturated fatty acid salt having an average carbon number of 10 to 22. Further, examples of the pH adjuster include sodium borate, sodium carbonate, sodium citrate, sodium metasilicate, sodium succinate, and sodium acetate. In terms of being easily dissolved in water, sodium citrate is preferred. Further, a cleaning aid may be added to the developer. The cleaning aid is a combination of the above surfactant and a pH adjusting agent to improve the cleaning (developing) ability of the developer. Specific examples thereof include amines such as monoethanolamine, diethanolamine, and triethanolamine, ammonium salts such as tetramethylammonium hydroxide, and paraffinic hydrocarbons. These may be added and mixed in the developing solution in an amount of 0.1 to 50% by mass, preferably 1 to 10% by mass. At the time of development, it is possible to apply vibration to the printing original plate by ultrasonic waves or the like, or to rub the surface of the original printing plate with a mechanical member such as a brush. The developed printing plate is preferably dried in an oven at, for example, 50 ° C for 15 to 120 minutes. The photosensitive layer containing the photosensitive resin composition of this embodiment may have a feeling of adhesion remaining on the surface of the plate after completion of drying depending on the composition. In this case, the adhesion feeling can be removed by a known surface treatment method. As such a surface treatment method, it is preferable to perform exposure treatment using active light having a wavelength of 300 nm or less. [Examples] Hereinafter, the present invention will be specifically described by examples, but the present invention is not limited thereto. <Production Example 1: Synthesis of a mixture containing the hydrophilic copolymer (A) containing the plasticizer component (F) used in Examples 1 to 8 and 10 and Comparative Examples 1 and 2 > With a stirring device and In the pressure-resistant reaction vessel of the temperature-regulating sleeve, 125 parts by mass of water is initially added as a reactive emulsifier (α-sulfo(1-mercaptophenoxy)methyl-2-(2-propenyloxy) 2 parts by mass of the EPA-poly(oxy-1,2-ethanediyl) ammonium salt "ADEKA REASOAP" (manufactured by Asahi Kasei Co., Ltd.), and the internal temperature is raised to 80 ° C for 5 hours and 6 hours, respectively. Adding a monomer mixture containing 10 parts by mass of styrene, 60 parts by mass of butadiene, 23 parts by mass of butyl acrylate, 5 parts by mass of methacrylic acid, and 2 parts by mass of acrylic acid at a constant flow rate and a third-dodecyl sulfide An oily mixture of 2 parts by mass of an alcohol, and 28 parts by mass of water, 1.2 parts by mass of sodium peroxodisulfate, 0.2 parts by mass of sodium hydroxide, and (α-sulfo(1-mercaptophenoxy)methyl group- 2 parts by mass of an ammonium salt of 2-(2-propenyloxy)ethoxy-poly(oxy-1,2-ethanediyl). Then, the temperature of 80 ° C was maintained for 1 hour in this state. Complete polymerization After cooling, the resulting copolymer latex was adjusted to pH 7 by using sodium hydroxide, and the unreacted monomer was removed by steam stripping, and filtered using a 200 mesh metal mesh. The aqueous dispersion of the hydrophilic copolymer (A) is obtained by adjusting the concentration of the solid content of the filtrate to 40% by mass. Further, 100 parts by mass of the hydrophilic copolymer (A) contained in the aqueous dispersion is used. 10 parts by mass of liquid polybutadiene [LBR352: manufactured by Kuraray] as a plasticizer component (F), and dried under reduced pressure at 80 ° C to obtain a hydrophilic copolymer (A) and a plasticizer. Mixture dried product of the component (F). <Production Example 2: Synthesis of a mixture containing the hydrophilic copolymer (A) containing the plasticizer component (F) used in Example 9> Use as a non-reactive emulsifier An aqueous dispersion of the hydrophilic copolymer (A) used in Example 9 was obtained in the same manner as in Production Example 1 except that sodium dodecylbenzenesulfonate was used instead of the reactive emulsifier. A mixture of the hydrophilic copolymer (A) and the plasticizer (F) was obtained in the same manner as in Production Example 1. Drying. <Production Example 3: Synthesis of a mixture containing the hydrophilic copolymer (A) containing the plasticizer component (F) used in Example 11 > Hydrophilic copolymer was obtained in the same manner as in Production Example 1. After the aqueous dispersion of (A), 10 parts by mass of liquid polybutadiene [LBR352] to be used as the plasticizer component (F) is added to 100 parts by mass of the hydrophilic copolymer contained in the aqueous dispersion. And a solution obtained by mixing 5 parts by mass of a carboxy modified product of a liquid acrylonitrile-butadiene copolymer (NBR) [DN-601: manufactured by Zeon, Japan], and drying under reduced pressure at 80 ° C while being mixed A mixed dry product of the hydrophilic copolymer (A) and the plasticizer (F). <Production Example 4: Synthesis of a mixture containing the hydrophilic copolymer (A) containing the compound (E) and the plasticizer component (F) used in Example 12> Hydrophilic copolymerization was obtained in the same manner as in Production Example 1. After the aqueous dispersion of the substance (A), 100 parts by mass of the hydrophilic copolymer contained in the aqueous dispersion is added as a (meth) selected from a surfactant and a polyalkylene glycol chain. a nonionic surfactant (XL-100: manufactured by Dai-ichi Kogyo Co., Ltd.) of at least one compound (E) in a group consisting of acrylate monomers, and a liquid state as a plasticizer component (F) 10 parts by mass of polybutadiene [LBR352] and a carboxyl group-modified product of liquid acrylonitrile-butadiene copolymer (NBR)) [DN-601: manufactured by Zeon, Japan] 5 parts by mass of a mixed solution, mixed on one side The mixture was dried under reduced pressure at 80 ° C to obtain a mixed dried product of the hydrophilic copolymer (A), the compound (E) and the plasticizer component (F). <Production Example 5: Synthesis of a mixture containing the hydrophilic copolymer (A) containing the compound (E) and the plasticizer (F) used in Example 13 > Hydrophilic copolymerization was obtained in the same manner as in Production Example 1. After the aqueous dispersion of the substance (A), 100 parts by mass of the hydrophilic copolymer contained in the aqueous dispersion is added as a (meth) selected from a surfactant and a polyalkylene glycol chain. a nonionic surfactant (XL-100: manufactured by Dai-ichi Kogyo Co., Ltd.) of at least one compound (E) in a group consisting of acrylate monomers, and a liquid state as a plasticizer component (F) 10 parts by mass of polybutadiene [LBR352] and a liquid carboxylic acid-modified acrylic polymer [CBB-3098: manufactured by K.K. Chemical Co., Ltd.] 5 parts by mass of a mixed solution, and dried under reduced pressure at 80 ° C while mixing A mixed dried product of the hydrophilic copolymer (A), the compound (E), and the plasticizer component (F) was obtained. <Production Example 6: Synthesis of Hydrophilic Copolymer (A) Used in Example 14 and Comparative Example 3> An aqueous dispersion of the hydrophilic copolymer (A) was obtained in the same manner as in Production Example 1, and was not added. The liquid polybutadiene was directly dried under reduced pressure at 80 ° C to obtain a dried product of the hydrophilic copolymer (A). <Production Example 7: Preparation of Infrared Ablation Layer> Ethylene-acrylic acid copolymer as an anionic polymer having a carboxylic acid group as an anionic polar functional group [SG-2000: manufactured by Tosoh Corporation, 20% by mass aqueous solution] 10 mass Parts, carbon black [BONJET CW-2: 20% by mass aqueous solution manufactured by Orient Chemical Industries] 5 parts by mass, mold release agent [KF-351: Shin-Etsu Chemical Co., Ltd.] 0.05 parts by mass, water 30 parts by mass, and ethanol 15 parts by mass The mixture was mixed to obtain a coating solution for forming an ablation layer. The coating solution for forming the ablation layer was applied to a PET film having a thickness of about 100 μm which was a cover film so as to have a film thickness after drying of 3 μm, and dried at 90° C. for 2 minutes. A laminate of the ablation layer and the cover film is obtained. (Example 1) (1) Production of photosensitive resin composition 110 parts by mass of a mixture containing the hydrophilic copolymer (A) and the plasticizer component (F) obtained in Production Example 1 was used, using a pressure kneader. Styrene-butadiene-styrene copolymer [D-KX405: manufactured by CLAYTONE] 75 parts by mass after mixing at 140 ° C, a small amount of liquid polybutadiene was added in a small amount of 15 minutes [LBR-352: manufactured by Kuraray] 120 parts by mass, 20 parts by mass of 1,9-nonanediol diacrylate, 20 parts by mass of 1,6-hexanediol dimethacrylate, and 5 parts by mass of 2,2-dimethoxyphenylacetophenone a mixture of 3 parts by mass of a surfactant (XL-100: manufactured by Dai-ichi Kogyo Co., Ltd.) and 5 parts by mass of 2,6-di-t-butyl-p-cresol, and kneading for 20 minutes to obtain a photosensitive film. Resin composition. (2) Production of printing original plate The above composition was taken out and sandwiched into a polyester film (hereinafter abbreviated as PET) having a thickness of 100 μm coated with an adhesive containing an elastomer, and a polyvinyl alcohol coated with a thickness of 5 μm. A PET having a thickness of 100 μm (PVA) layer is formed into a plate having a thickness of 1.14 mm by using a press heated to 120 ° C, and then the PET coated with the PVA layer is peeled off to obtain a support (PET). - a laminate of photosensitive layers. With respect to the obtained laminate, the infrared ablation layer having the cover film obtained in Production Example 7 was laminated in contact with the photosensitive layer to obtain a printing original. (3) The printing plate is manufactured from the side of the printing original support (PET coated with the adhesive), and the ultraviolet light exposure machine (manufactured by Nippon Seiko Co., Ltd.) is used in such a manner that the height (RD) of the hardened pattern is about 0.6 mm. JE-A2-SS) is exposed. Next, the cover film of the infrared ablation layer was peeled off, and the infrared ablation layer was drawn using a laser drawing machine (CDI (Cyrel Digital Imager)) manufactured by ESKO, and the above exposure machine was used from the side of the infrared ablation layer. Exposure for 10 minutes. After the exposure, an aqueous solution (water-based developing solution) of 1% of NISSAN SOAP was prepared, and washed (developed) at 40 ° C using a washing machine (JOW-A3-P) manufactured by Nippon Seiki Co., Ltd. to remove the unexposed portion. Further, regarding the washing time, the unexposed printing original plate was washed in advance for 5 minutes, and the thickness d (mm) to be cut off was measured, and RD × d / was calculated according to the desired pattern height (RD = 0.6 (mm)). 5 x 1.5 (minutes) as the time. After drying, it was post-exposed by an ultraviolet germicidal lamp or an ultraviolet chemical lamp to obtain a printing plate. (4) Evaluation (a) Evaluation of Dispersion State of Phase Containing Hydrophilic Copolymer (A) in Photosensitive Resin Composition The photosensitive resin composition was sandwiched between two PET films which were subjected to release treatment at 120 ° C A sheet-like molded article having a thickness of 1 mm was obtained by a press. High-pressure mercury lamps using an ultraviolet exposure machine (JE-A2-SS manufactured by Nippon Seiki Co., Ltd.) on both sides of the sheet-like molded article were exposed at 7,500 mJ, respectively. Furthermore, the exposure of the high pressure mercury lamp is measured at a wavelength of 365 nm. Next, the center portion of the molded article after the exposure was horizontally cut into small pieces in the sheet, and the cut surface was formed by a frozen slicer to obtain a film slice of the observation sample. The 30 μm square of the section of the film section was observed using a scanning probe microscope (SPM) of an atomic force microscope (AFM) [Dimension Icon] manufactured by Bruker. For observation, the Tapping mode was selected, and a rectangular cantilever made of Si having a length of 125 μm, a width of 40 μm, and a thickness of 4 μm was used as a cantilever. The cantilever is sold by Bruker Corporation under the model number of NCHV, and the spring constant is about 40 N/m. Data processing was performed using the data processing software Naroscope Analysis Ver 1.40 attached to the Dimension Icon. The phase image is displayed as shown in FIG. 1, and the distortion of the entire image is corrected by a Plane fit process, and the phase indicating the phase containing the hydrophilic copolymer (A) is brightened by a flattening process. Regional uniformity. Secondly, by particle analysis, the image of the phase containing the hydrophilic copolymer (A) in the image after image processing (binarization) is substantially identical to the phase image before image processing, Image processing was performed by visually confirming that the threshold value was determined, and as shown in FIG. 2, the phase containing the hydrophilic copolymer (A) and the phase containing the elastomer (B) were separated to obtain a hydrophilic copolymer (A). Area ratio of 30 μm square A . Further, the phase area was measured for each phase containing the hydrophilic copolymer (A), and a histogram was prepared. According to the histogram, the phase area is calculated to be 3 μm. 2 Above and less than 100 μm 2 The ratio of the area of the phase to the total area of the phase containing the hydrophilic copolymer (A) (%). (b) Evaluation of the printability of the original printing plate (water developability) The NISSAN SOAP 1% aqueous solution was filled in the washing machine (JOW-A3-P) manufactured by Japan Electronic Seiki, and the printing original obtained in (2) was obtained. The cover film of the infrared ablation layer was peeled off and washed (developed) at 40 ° C for 5 minutes. The case where 0.2 mm or more was cut off was evaluated as ○, and the case where the amount to be cut was 0.2 mm or less was evaluated as ×. (c) Evaluation of Solvent Resistance of Printing Plate As a solvent resistance test for evaluating the resistance of a printing plate to an aqueous ink, the printing plate obtained in (3) was simulated in a 10% aqueous solution of isopropyl alcohol at 23 The mixture was immersed at ° C for 24 hours, and the mass increase rate (water swelling ratio) (%) was measured. When the mass increase rate is less than 2%, it is evaluated as ○, and when it is 2% or more, it is evaluated as ×. (d) Evaluation of print durability of the printing plate In order to evaluate the strength (printing resistance) of the printing plate, a wear wheel (a TABER abrasion tester manufactured by TESTER SANGYO, a hard wear wheel) was used for the abrasion resistance test. A printing plate of the entire solid portion was produced in the same manner as in (2), and the obtained printing plate was immersed in a 10% isopropyl alcohol aqueous solution instead of the aqueous ink for 16 hours, and then the plate surface was rotated 1000 times using the abrasion wheel. Abrasion (mg/cm) 2 ). Furthermore, the amount of wear is the reduction of the mass of the printing plate (mg) divided by the area of contact between the wear wheel and the solid part (cm). 2 And find it. The wear amount is 10 mg/cm 2 The above case was evaluated as ×, and the case where it was not reached was evaluated as ○. (e) Evaluation of transparency (haze) of the printing original plate The photosensitive resin composition was sandwiched between two sheets of a PET film having a thickness of 100 μm which was subjected to release treatment, and formed into a thickness of 3 mm by using a press heated to 120 ° C. Board. The haze of a sheet formed into a 3 mm thick layer in an uncured state was measured using a haze meter (NDH-5000) manufactured by Nippon Denshoku Industries Co., Ltd. When the haze was 20 or less, it was evaluated as ○, and when it was more than 20 and not more than 50, it was evaluated as Δ, and 50 or more was evaluated as ×. (f) Evaluation of image reproducibility before and after moisture absorption The printing plate prepared before (3) (before moisture absorption) and the printing original plate produced in (2) were stored in a thermostatic chamber having a humidity of 40% at 40 °C. After one week, the printing plate (after moisture absorption) produced in the same manner as (3) was compared for a hollow line width and depth of 500 μm. The case where the difference between the line width and the depth before and after moisture absorption was less than 5% was evaluated as ○, the case where 5% or more and less than 10% was evaluated as Δ, and the case where 10% or more was evaluated as ×. (Examples 2-5, 7, and 10) The amount of addition of the elastomer (B), the polymerizable unsaturated monomer (C), the compound (E), and the subsequent mixed liquid polybutadiene was changed. A photosensitive resin composition having the composition shown in Table 1 and a master and a printing plate for flexographic printing containing the photosensitive resin composition were obtained in the same manner as in Example 1. The evaluation results of the obtained photosensitive resin composition, printing original plate, and printing plate are shown in Table 2. (Examples 6 and 8) The addition amount of the polymerizable unsaturated monomer (C), the compound (E), and the subsequently mixed plasticizer component (F) (liquid polybutadiene) was changed, and further, polyethylene-2 was used. A photosensitive resin composition having the composition shown in Table 1 and containing the photosensitive material in the same manner as in Example 1 except that the alcohol (diethyl methacrylate) (14G, manufactured by Shin-Nakamura Chemical Co., Ltd.) was used as the compound (E). The original and printed version of the flexographic printing of the resin composition. The evaluation results of the obtained photosensitive resin composition, printing original plate, and printing plate are shown in Table 2. (Example 9) A mixture comprising the hydrophilic copolymer (A) and the plasticizer component (F) obtained in Production Example 2 was used instead of the mixture obtained in Production Example 1, except that Example 1 was used. In the same manner, a photosensitive resin composition and a flexographic printing original plate and a printing plate containing the photosensitive resin composition were obtained. The evaluation results of the obtained photosensitive resin composition, printing original plate, and printing plate are shown in Table 2. (Example 11) 115 parts by mass of a mixture containing the hydrophilic copolymer (A) and the plasticizer component (F) obtained in Production Example 3, copolymerization of styrene-butadiene-styrene, using a pressure kneader After 100 parts by mass of the product [D-KX405: manufactured by CLAYTONE] was mixed at 140 ° C, a liquid polybutadiene [LBR-352: manufactured by Kuraray] was added in a small amount for 15 minutes in this state, and 90 parts by mass, 1, 20 parts by mass of 9-nonanediol diacrylate, 20 parts by mass of 1,6-hexanediol dimethacrylate, 5 parts by mass of 2,2-dimethoxyphenylacetophenone, surfactant [XL -100: First Industrial Pharmaceutical Manufacturing] A mixture of 3 parts by mass and 5 parts by mass of 2,6-di-t-butyl-p-cresol was mixed and further kneaded for 20 minutes to obtain a photosensitive resin composition. Using the photosensitive resin composition, a master and a printing plate for flexographic printing were obtained in the same manner as in Example 1. (Example 12) Styrene was mixed at 140 ° C in 118 parts by mass of a mixture containing the hydrophilic copolymer (A) and the plasticizer component (F) obtained in Production Example 4 using a pressure kneader. After 100 parts by mass of the butadiene-styrene copolymer [D-KX405: manufactured by CLAYTONE], the liquid polybutadiene [LBR-352: manufactured by Kuraray] was added in a small amount for 15 minutes while maintaining this state, 90 parts by mass, 1 20 parts by mass of 9-nonanediol diacrylate, 20 parts by mass of 1,6-hexanediol dimethacrylate, 5 parts by mass of 2,2-dimethoxyphenylacetophenone, and 2,6 A mixture of 5 parts by mass of di-t-butyl-p-cresol was mixed and further kneaded for 20 minutes to obtain a photosensitive resin composition. Using the photosensitive resin composition, a master and a printing plate for flexographic printing were obtained in the same manner as in Example 1. (Example 13) Styrene was mixed at 140 ° C in 118 parts by mass of the mixture containing the hydrophilic copolymer (A) and the plasticizer component (F) obtained in Production Example 5 using a pressure kneader. After 100 parts by mass of the butadiene-styrene copolymer [D-KX405: manufactured by CLAYTONE], the liquid polybutadiene [LBR-352: manufactured by Kuraray] was added in a small amount for 15 minutes while maintaining this state, 90 parts by mass, 1 20 parts by mass of 9-nonanediol diacrylate, 20 parts by mass of 1,6-hexanediol dimethacrylate, 5 parts by mass of 2,2-dimethoxyphenylacetophenone, and 2,6 A mixture of 5 parts by mass of di-t-butyl-p-cresol was mixed and further kneaded for 20 minutes to obtain a photosensitive resin composition. Using the photosensitive resin composition, a master and a printing plate for flexographic printing were obtained in the same manner as in Example 1. (Example 14) 100 parts by mass of a dried product of the hydrophilic copolymer (A) obtained in Production Example 6, and 75 parts by mass of a styrene-butadiene-styrene copolymer [D-KX405: manufactured by CLAYTONE], 75 parts by mass of liquid polybutadiene [LBR-352: manufactured by Kuraray], 20 parts by mass of 1,9-nonanediol diacrylate, 20 parts by mass of 1,6-hexanediol dimethacrylate, 2 5 parts by mass of 2-dimethoxyphenylacetophenone, surfactant [XL-100: manufactured by Daiichi Kogyo Co., Ltd.] 3 parts by mass, and 2,6-di-t-butyl-p-cresol 5 A mixture of parts by mass was simultaneously added to a pressure kneader and kneaded for 300 minutes to obtain a photosensitive resin composition. Using the photosensitive resin composition, a master and a printing plate for flexographic printing were obtained in the same manner as in Example 1. The evaluation results of the obtained photosensitive resin composition, printing original plate, and printing plate are shown in Table 2. (Comparative Example 1) 110 parts by mass of the aqueous dispersion of the hydrophilic copolymer (A) obtained in Production Example 1 was dried using a pressure kneader, and a styrene-butadiene-styrene copolymer [D] -KX405: manufactured by CLAYTONE] After mixing 20 parts by mass at 140 ° C, a small amount of liquid polybutadiene [LBR-352: manufactured by Kuraray] was added in small portions for 15 minutes, and 1,9-nonanediol diacrylic acid was added. 20 parts by mass of ester, 20 parts by mass of 1,6-hexanediol dimethacrylate, 5 parts by mass of 2,2-dimethoxyphenylacetophenone, surfactant [XL-100: First Industrial Pharmaceutical Co., Ltd. A mixture of 3 parts by mass and 5 parts by mass of 2,6-di-t-butyl-p-cresol was added, and after the addition, the mixture was further kneaded for 20 minutes to obtain a photosensitive resin composition. Using the photosensitive resin composition, a master and a printing plate for flexographic printing were obtained in the same manner as in Example 1. The evaluation results of the obtained photosensitive resin composition, printing original plate, and printing plate are shown in Table 2. Moreover, the SPM image of the cross section of the cured product of the photosensitive resin composition of the comparative example 1 is shown in FIG. In Comparative Example 1, the area ratio of the phase containing the hydrophilic copolymer (A) was large, and the area containing the hydrophilic copolymer (A) was 100 μm. 2 the above. (Comparative Example 2) The addition amount of the elastomer (B) (styrene-butadiene-styrene copolymer) and liquid polybutadiene was changed as shown in Table 1, except that Comparative Example 1 was used. In the same way, the original and printed versions for flexographic printing are obtained. The evaluation results of the obtained photosensitive resin composition, printing original plate, and printing plate are shown in Table 2. In Comparative Example 2, the area ratio of the phase containing the hydrophilic copolymer (A) itself was small, and the area containing the hydrophilic copolymer (A) was less than 3 μm. 2 . (Comparative Example 3) 100 parts by mass of a dried product of the hydrophilic copolymer (A) obtained in Production Example 6, and 75 parts by mass of a styrene-butadiene-styrene copolymer [D-KX405: manufactured by CLAYTONE], 75 parts by mass of liquid polybutadiene [LBR-352: manufactured by Kuraray], 20 parts by mass of 1,9-nonanediol diacrylate, 20 parts by mass of 1,6-hexanediol dimethacrylate, 2 , 2 parts by mass of 2-dimethoxyphenylacetophenone and a surfactant [XL-100: First Industrial Pharmaceutical Manufacturing] 3 parts by mass, 2,6-di-t-butyl-p-cresol 5 mass The mixture was simultaneously added to a pressure kneader and kneaded for 30 minutes to obtain a photosensitive resin composition. Using the photosensitive resin composition, a master and a printing plate for flexographic printing were obtained in the same manner as in Example 1. The evaluation results of the obtained photosensitive resin composition, printing original plate, and printing plate are shown in Table 2. Moreover, the SPM image of the cross section of the cured product of the photosensitive resin composition of the comparative example 3 is shown in FIG. In Comparative Example 3, the majority of the phase containing the hydrophilic copolymer (A) was 100 μm. 2 the above. [Table 1] [Table 2] [Industrial Applicability] The resin composition for flexographic printing of the present invention can be suitably used as a material for a photosensitive layer of a flexographic printing original, particularly a flexographic printing original for water development. The present application is based on Japanese Patent Application No. 2015-194669, filed on Jan. 30,,,,,,,

圖1為實施例1之柔版印刷用感光性樹脂組合物之硬化物之剖面的SPM(Scanning Probe Microscopy，掃描探針顯微鏡)像。 圖2為對圖1之SPM像進行圖像處理而分離成包含親水共聚物(A)之相與其他相之圖。 圖3為比較例1之柔版印刷用感光性樹脂組合物之硬化物之剖面的SPM像。 圖4為比較例3之柔版印刷用感光性樹脂組合物之硬化物之剖面的SPM像。Fig. 1 is an SPM (Scanning Probe Microscopy) image of a cross section of a cured product of the photosensitive resin composition for flexographic printing of Example 1. Fig. 2 is a view showing the phase separation of the SPM image of Fig. 1 into a phase containing the hydrophilic copolymer (A) and other phases. 3 is an SPM image of a cross section of a cured product of the photosensitive resin composition for flexographic printing of Comparative Example 1. FIG. 4 is an SPM image of a cross section of a cured product of the photosensitive resin composition for flexographic printing of Comparative Example 3. FIG.

無no

Claims (11)

一種柔版印刷用感光性樹脂組合物，其係至少含有如下成分者： (A)親水性共聚物、 (B)彈性體、 (C)聚合性不飽和單體、及 (D)光聚合起始劑，且 於該樹脂組合物之硬化物之剖面中，包含上述親水性共聚物(A)之相所占之比率(面積率)SA 為15%以上且未達60%， 上述剖面中之包含上述親水性共聚物(A)之相之中，相面積為3 μm2 以上且未達100 μm2 之相所占之比率為20(面積%)以上。A photosensitive resin composition for flexographic printing comprising at least the following components: (A) a hydrophilic copolymer, (B) an elastomer, (C) a polymerizable unsaturated monomer, and (D) photopolymerization In the cross section of the cured product of the resin composition, the ratio (area ratio) S A of the phase containing the hydrophilic copolymer (A) is 15% or more and less than 60%, in the above cross section. Among the phases containing the hydrophilic copolymer (A), the ratio of the phase having a phase area of 3 μm 2 or more and less than 100 μm 2 is 20 (area%) or more. 如請求項1之柔版印刷用感光性樹脂組合物，其中上述SA (面積%)與上述樹脂組合物中之親水性共聚物(A)之質量比率WA (質量%)之比SA /WA 為1.35以上。The photosensitive resin composition for printing with flexographic request entry of 1, wherein said S A (area%) and the resin composition of the hydrophilic copolymer (A) mass ratio of W A (% by mass) ratio S A /W A is 1.35 or more. 如請求項1或2之柔版印刷用感光性樹脂組合物，其中相對於上述親水性共聚物(A)100質量份，包含50～250質量份之上述彈性體(B)、10～200質量份之上述聚合性不飽和單體(C)、0.1～50質量份之上述光聚合起始劑(D)。The photosensitive resin composition for flexographic printing according to claim 1 or 2, wherein the elastomer (B) and the mass of 10 to 200 are contained in an amount of 50 to 250 parts by mass based on 100 parts by mass of the hydrophilic copolymer (A). The above polymerizable unsaturated monomer (C) and 0.1 to 50 parts by mass of the above photopolymerization initiator (D). 如請求項1至3中任一項之柔版印刷用感光性樹脂組合物，其進而含有0.1～15質量份之選自由界面活性劑及具有聚伸烷基二醇鏈之(甲基)丙烯酸酯單體所組成之群中之至少1種化合物(E)。The photosensitive resin composition for flexographic printing according to any one of claims 1 to 3, further comprising 0.1 to 15 parts by mass of (meth)acrylic acid selected from the group consisting of a surfactant and a polyalkylene glycol chain At least one compound (E) of the group consisting of ester monomers. 如請求項1至4中任一項之柔版印刷用感光性樹脂組合物，其中相對於上述親水性共聚物(A)100質量份，進而含有1～250質量份之塑化劑成分(F)。The photosensitive resin composition for flexographic printing according to any one of Claims 1 to 4, further containing 1 to 250 parts by mass of the plasticizer component (F) with respect to 100 parts by mass of the hydrophilic copolymer (A). ). 如請求項5之柔版印刷用感光性樹脂組合物，其中上述塑化劑成分(F)包含至少1種經OH基及/或羧基改性而成之液狀聚丁二烯之末端改性物。The photosensitive resin composition for flexographic printing according to claim 5, wherein the plasticizer component (F) comprises at least one terminal modification of liquid polybutadiene modified with an OH group and/or a carboxyl group. Things. 如請求項1至6中任一項之柔版印刷用感光性樹脂組合物，其中至少於包含上述親水性共聚物(A)之相中包含上述聚合性不飽和單體(C)。The photosensitive resin composition for flexographic printing according to any one of claims 1 to 6, wherein the polymerizable unsaturated monomer (C) is contained in at least the phase containing the hydrophilic copolymer (A). 如請求項1至7中任一項之柔版印刷用感光性樹脂組合物，其中上述彈性體(B)為熱塑性嵌段共聚物。The photosensitive resin composition for flexographic printing according to any one of claims 1 to 7, wherein the elastomer (B) is a thermoplastic block copolymer. 如請求項1至8中任一項之柔版印刷用感光性樹脂組合物，其中上述親水性共聚物(A)係包含源自含有不飽和雙鍵之反應性乳化劑之單元、且進行內部交聯而成之聚合物粒子。The photosensitive resin composition for flexographic printing according to any one of claims 1 to 8, wherein the hydrophilic copolymer (A) contains a unit derived from a reactive emulsifier containing an unsaturated double bond, and is internally Crosslinked polymer particles. 一種如請求項1至9中任一項之柔版印刷用感光性樹脂組合物之製造方法，其依序包括以下所記載之步驟1～3： 1.於含親水性共聚物(A)之水分散液中，添加選自由界面活性劑及具有聚伸烷基二醇鏈之(甲基)丙烯酸酯單體所組成之群中之至少1種化合物(E)及/或塑化劑成分(F)之步驟； 2.自上述含親水性共聚物(A)之水分散液中去除水之步驟；及 3.於步驟2中所獲得之包含親水性共聚物(A)之混合物中，添加彈性體(B)、聚合性不飽和單體(C)、及光聚合起始劑(D)，並進行混練之步驟。A method for producing a photosensitive resin composition for flexographic printing according to any one of claims 1 to 9, which comprises the following steps 1 to 3 as follows: 1. In the hydrophilic copolymer (A) In the aqueous dispersion, at least one compound (E) and/or a plasticizer component selected from the group consisting of a surfactant and a (meth) acrylate monomer having a polyalkylene glycol chain are added ( a step of F); a step of removing water from the aqueous dispersion containing the hydrophilic copolymer (A); and 3. a mixture of the hydrophilic copolymer (A) obtained in the step 2, added The step of kneading the elastomer (B), the polymerizable unsaturated monomer (C), and the photopolymerization initiator (D). 一種柔版印刷原版，其具有包含如請求項1至9中任一項之柔版印刷用感光性樹脂組合物之感光層。A flexographic printing original having a photosensitive layer comprising the photosensitive resin composition for flexographic printing according to any one of claims 1 to 9.
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